I like Obsidian, too, having recently switched over from 9 years of OneNote (the fact that there's a tool to import my OneNote notes helped a lot). The most important tip for getting started with Obsidian, in my mind, is to absolutely ignore all of the Obsidian "power users." I'm 99% convinced that no one actually uses zettelkasten seriously, but even if so, it's overkill for when you're just checking out the app. An…
No affiliation, just a happy user for over a year now.
If you take kindle highlights when you read, the https://github.com/hadynz/obsidian-kindle-plugin plugin is amazing for auto generating source files with those highlights in (and other templated sections you wish to include in a review).