I'm ADHD and Org-mode has majorly improved my capacity to organise my life, because it has let me create a system that integrates most things I do in a way that works for me and my quirks.

My current setup is....

- Capture todos as they pop into my head, inbox, browser, rss feed, etc, into a simple daily.org file whose parents are the dates of the events. Here's the org-capture-template:

  ("c" "Do on date" entry (file+olp+datetree "~/org/daily.org")
    "\* TODO %? %^G\n%t\n%a\n" :time-prompt t :clock-resume t)`

It outputs a tree like this:

  ** 2021-10 October
   *** 2021-10-01 Friday
    **** TODO Reply to Cecile about buying keyboard                        :PERSONAL:
    <2021-10-01 Fri>   
    [[mu4e:link-to-email][Re: Hello]]
   *** 2021-10-04 Monday
    **** TODO Haircut                                                      :PERSONAL:
    <2021-10-04 Mon 11:00>

- If it's part of a big project or more of a datastore, give it its own org file, and refile captures there. Use org-taskjuggler for Gantt charts.

- If it's a long standing task (eg work on book, read Practical Common Lisp) set it up as a habit so that not only it repeats at the desired intervals but I get a diagram which says how well I've kept it up.

- Anything to do with friends and birthdays go in contacts.org, so that I can keep an eye on how much I see people.

- Load up Org Agenda and commit to a todo by clocking in (I). I almost never check how long I've spent, it's more just about committing to myself. Mark things as done (t d) as appropriate.

- Archive DONEs ($) intermittently rather than immediately, so that I can remind myself that I've done stuff.

Stick to the rule that TODOs are only for things I expect myself to actually do, rather things I want myself to want to do. (my cycle is TODO DOING WAITING HOLD | DONE CANCELLED SCRATCH).

I used to have different org files for different projects/aspects of my life but refiling things created too much friction. Most things just need to go into daily.org, and that's fine.