That's a good idea. I've seen Obsidian, but I'm taking notes on notepad, just to be sure I write it with hand. It's so hard for me because I was typing more than writing, so I kinda forget to write :). But I like your approach, notes are great because 5 minutes after reading something you forget almost all of it :)
Notepad works too! I think the key is to force yourself to actively think when reading, and if you don't want to do that, then don't bother reading. Obsidian helps because of the ease to linking other notes, and that I think it a big benefit when you start having a bunch of notes.