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The Dataview plugin is the most critical one. You can create queries with the metadata in your notes (YAML frontmatter and # hashtags). If that sounded like a bunch of non-sense I highly encourage you to dig into it, because I had no idea what those words meant either but it took my note taking to a new level. I think of my Obsidian vault as my second brain.
Below are some cool examples of vaults that you can click through. Also note that because the obsidian pages are in markdown format you can use the Jekyll engine to directly turn them into web pages without any coding (this is how GitHub Pages works)
If you know how to do a bit of coding (or use ChatGPT) you can incorporate APIs from other apps in your obsidian vault. Maybe you want to make a fancy home page that displays all your tasks from ToDoist, alongside the RSS feeds to your favorite podcasts and YouTube channels. Maybe you are tracking your habits and using DataView to compile all relevant instances of #habit tags into one calendar for a birds eye view.
Same with my partner’s American family. They dont believe a word about what’s happening. And if we can’t turn the domestic terrorists in our homes back to reality what chance do we stand turning back the country.