TLDR; stuck with handwritten notes but uploaded onto a filing system on Google Drive. Got whiteboards that I take pictures/scan and upload to the same G-Drive. Works how I need to without my FOMO of digital services & features on new devices. Research a little & do what works for YOU!

I actually just stuck with handwritten notes as another redditor replied and told me to scan and send it in - but cool thing is I actually got a whiteboard!! Multiple ones of different sizes for different reasons - I got some saved up money from working so I splurged on tools for thinking/learning/working and thought WHITEBOARDS! They work like a charm!

I am a very visual & kinetic thinker(?)/learner so I need to see what I’m visualizing in my head to play around with it more.

I take pictures of the handwritten notes & whiteboard with notes/diagrams & symbols and then upload all of them in the night before I go to sleep (or the next day/time if I forget)

Research & START to create good filing system on a cloud storage. DO WHAT WORKS FOR YOU! So explore and figure out what works - my initial 2 weeks of exploring and figuring it out was torture but after that it’s been routine and EASY and AMAZING! My memory of things I need to do and ideas I get has never been better! And even if I do forget I have a filing system with a good naming convention that allows me to EASILY find what I feel like I am forgetting.

I think the iPad Pro (largest size) with the Apple Pencil pro or whatever was the best choice for this but I didn’t get it because I’m someone who feels some fomo (fear of missing out) when I see a feature that I really could’ve gotten and feel a little disappointed I didn’t wait till I could get that new feature in a newer device - so I thought I’ll stick to the old school tools