I have often troubles deciding what should I focus on during Deep Work. How do I chose what to work on when there is so many things to do?

Prioritise what to work on during deep work by ranking your to-do list by importance and urgency. The not-so-important and non-urgent tasks don't need to be done right now.

Priority. What is most important for you to have done. Or you could do something that you find the most hard to keep consentrated on. Personally I use it for paper work, something that is easy to get distracted from, and takes a lot of thought.

I often feel frazzled because I have so many things to do, yet no clear desire to do Deep Work on one particular thing. I've found two things that help me tremendously when I get like this. First is the Fabulous "What are my 3 most important tasks?" habit. It's a challenge to pick ONLY THREE things out of my day that are "important," but it has been a wonderful exercise to get me thinking in terms of PRIORITIES. (Some tasks are just noisy — they demand to be done RIGHTNOW! But they aren't actually a higher priority than others.) If I have a list of my 3 Priorities for the day, I can just grab one of those for Deep Work sessions. I'm finding it helpful to do a 3 Priorities list for my projects too, so I can be ready to grab one for Deep Work. (As an example, I'm an artist, so I keep 2 paying projects and one personal project on my priority list.)
The second method that helps me SO MUCH for Deep Work is the "Just Get Started" exercise in the Deep Work habit. It's ready, set, go, and just grab ANYTHING to do! It's only for a few minutes, so I feel that it doesn't matter if I don't wind up moving my projects along. But I almost always get inspired and work longer than those few minutes; and it always helps to clear my head. And getting even a little bit done helps me feel less stressed about the rest!

Consider your effort as an investment… put a number on it (e.g. the effort i will put in the next hour is worth 1000 dollars), then as yourself where can you invest this effort to get the best return? Who is more worthy of your effort right now?

Deep work happens best if you are already rolling – it's easier to keep going than to get started. The difference between the work you do regularly and deep work is that Deep Work is a period where you give yourself permission to focus. Even if there's deadlines, varying priorities, other responsibilities, it is a time to do something for 25 minutes of your own choice, based on your goals in life. You won't get it all done in 25 minutes, but it will help! If you schedule deep work later in your day, it will also make deciding easier since you'll have a goal that needs more immediate attention, especially if this is at work.

Usually, I do the thing that is due before anything else and then work down from there. Another thing that works well is to do the hardest thing first. If you can get the harder parts out of the way first, then when you get to the other stuff, it is not as stressful and is easier to handle.

Prioritisation is key. It's very important to take time to not only do a to do list, but to prioritise it, to help you know where to focus. There are many tools to do this, such as doing a 1-3-5 list, which is a list of 1 big task, 3 medium tasks, 5 small tasks that you will do that day. Or you can use an urgent/important matrix, where you have two axes, placing tasks by whether they are important, urgent or both.

That is why it's so important to find your three most important tasks. Focus only on the most important one first. If the task is too short, I think that it's okay to set to complete two short tasks within your deep concentration time.

1. Cal Newport wrote a book on deep work. Find a short YouTube summary here https://youtu.be/gTaJhjQHcf8

2. Deep work sessions should be focused on things that push your brain to work harder– stuff you cannot do well if you are distracted. Stuff that creates new value and that grows your individual skill. Stuff that makes you uniquely irreplaceable. Do not do mundane things that you could do distracted or that do not demand your absolute concentration.

For example, are you trying to finish a project, write a book, finish an art piece, solve a scientific problem or answer a fundamental question that requires a lot of your brain power and concentration? This is what you put aside for deep work sessions. Make sure that you have set aside a comfortable and distraction-free time and place for deep work sessions

3. Think of your goals: annual or quarterly or five year goals. Focus your deep work sessions on achieving these. Achieving a goal usually takes many small steps.
Choose a specific goal and Make your earliest deep work sessions about breaking down your goal into smaller tasks until you have bite-sized tasks that you can break down into daily specifics.
This way, your next several deep work sessions will have tasks already defined clearly and you will spend less time deciding on what to use your sessions for.

4. Look up Cal Newport's book Deep Work and the many easy summaries on YouTube and other platforms.
Success!

The Thing which you Most like to do.
I don't know what you should do, But yes I can tell you what I do is.
I choose the task which I love to do, So there is no much efforts to do that. And since I love that task, i can concentrate on that.
Eg. I love Reading books, so that is my first task to do.

I try to organize things based on their urgency (must it be done asap?), their importance (can I live without it?), their time to completion (can I get it done quickly?) and their impact (does it bring important returns?). Your will to get something done will also play a role in this and sometimes you'll need to fight against the urge to just do the things you enjoy most. Another pitfall of mine is going for the quickest wins just to reduce the to-do list when these things are neither urgent nor impactful. I don't completely reject these though because 1. Sometimes you need that win, 2. Reducing your list makes it look more manageable, 3. Your mind can more easily focus on bigger projects without distraction, 4. Not all energy and moods are conducive to all tasks and sometimes you just need to acknowledge the state you're in an get things done accordingly. If you look at your list and it seems overwhelming, try to find those things that take under 5 minutes (really!) to get done and kick them off the list. Then get real about your list: start with the most urgent (perhaps things with deadlines) and then the most impactful (which will bring the most to you even if doing them is hard). Don't be afraid to cut things off your list by analising their importance (do you need to get that done yourself? Was it wishful thinking and at this stage you are better off putting your energy elsewhere?). Hope this helps

First I prioritize my task list to what's most important then I focus on the top task. Sometimes I will also choose a task I've been procrastinating on and finally get it off my plate.

I would highly suggest prioritizing, though I am normally ordering my tasks based on their due dates. Apart from that, I think that just getting started will cause an avalanche of productivity – so perhaps choose an "easier" task first.

Prioritizing is crucial. I always start with the most urgent tasks. When it comes to projects with longer deadlines, the easiest way to deal with them is to split them into smaller tasks and set deadlines for these tasks. Makes long haul projects easier and lessens the stress.

Clear space so nothing influences you, take a few moments to clear your mind. Make a drink or snack and go to the toilet, this will help prevent distractions
Focus on your To Do List / Top 3
Write a letter to yourself, partner or close friend
By shifting focus you will find focus

I typically use the classic important/urgent matrix. I try to focus on something important that takes at least 30 minutes to do and benefits from sustained concentration. If it’s urgent too, that’s a plus. But in general, I focus on important things that require concentration and in some cases, that I’ve been putting off. I find that the no distractions rule really forces me to just get going on a task I’m dreading, which has real value in terms of productivity.

I guess choose between 2 things.
• Urgent & Important or
(work that must get done as a matter of urgency & has a high impact)
• Not urgent & important
(This is capacity building work).
The above should also be work that you “get your teeth into” & can complete in the time frame you set for yourself …

Avoid …
• emails, WhatsApp’s, phone calls, Facebook, other time wasting social media distractions & any “bitty” work that you can batch & complete as one batch of many small items …

I feel the same way. Some times it feels like whatever I choose is not the right thing.
I think it's making the choice and doing the work that is the important thing.
There is always more work.
It's being into the work that makes me feel good.