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For me it's reminders. I use slack for work, and whenever anything comes up that I need to take care of (personal or work related) I'll tell slack "/remind me about <thing> tomorrow/next week".
I've been doing this for years. I have it on my phone and computer so it's easy to view and add new reminders whenever I need. I didn't think slack is crucial to use but I find it to be the most convenient, even more so then dedicated reminder apps
I use Notion+Notion Calendar for this and I delegate to it a lot of stuff: bureaucracy, booking the barber, changing the bedsheets, all my work, birthdays, etc etc. How can people trust their brain with more than two or three items is unfathomable to me. I mean, when I was younger I could keep in mind a dozens upcoming appointments and go through them every few hours to make sure I wouldn't miss anything, but as soon as your routine is disturbed by work stuff, it's impossible.
That sounds like exactly the app I've been looking for.
I've heard notion calendar is the best calendar software out there. If it also supports reminders really well (and I'm already a notion user), then maybe this is worth checking out.
My ADHD would not allow me to function without reminders.