checkout https://github.com/Obsidian-TTRPG-Community/ObsidianTTRPGShare and if you are for example running Pathfinder 2e you can use https://github.com/Obsidian-TTRPG-Community/Pathfinder-2E-SRD-Markdown as a starting point for your notes, it contains pretty much everything from the PRD already in markdown format, and the bestiary notes are suited for Fantasy Statblock and the Initiative Tracker.

I had https://www.youtube.com/watch?v=-gJZe9BN9pU as a guide :)