Welcome to Bullet Journal Community! This was one of the topic I have been missing on lemmy, and while there is one bullet journal community already, it has no posts and no mods, so creating a new one here.
Feel free to ask any questions, or discuss anything related to bullet journaling. You are also more than welcome to share your spreads, as long as it's not just aesthetics. Write what worked or didn't work for this spread, or if it's a new spread, what are you planning to use it for.
This 4 minute video is a very good introduction to bullet journal, by Ryder Carroll himself. This gives you a run-down of the basic components of bujo, and can get you started.
The system itself is very extensible though, and people have made many variations according to their needs. Feel free to ask any questions if you need any help.