I use .txt files a lot (more recently markdown) although I don’t link them in anyway. I have one for each project or idea and add notes to them as and when I think of them. When I am working on a project I have files for notes, todos, and a scrapbook - though I use a notebook as well for jotting down things.
I do the same for things I come across that I find interesting - I have notes for health/diet related topics too for instance.
While I don’t link notes, I do have sections. I wouldn’t mind trying a tool that easily linked files, however I wouldn’t want something propriety - as I wouldn’t want to lose all my notes if the program stopped working (hence favouring basic .txt or markdown files).
Which of the tools in your post do you recommend that uses simple txt files or files I can use without the program if I decide to stop using it?
On a slightly separate note I also read that if you have an idea at night while in bed, you should write it down or it will keep you awake as subconsciously you’ll be worried about forgetting it! I usually just text myself whatever it is I need to remember, or write a larger note if need be. Sometimes if I have thought of a brilliant paragraph or two for something I am writing I’ll get up to type it up so I don’t forget it! If it’s not something I want to be private, I will use Apple Notes - as that automatically syncs notes to your Apple devices.