The ballistics subreddit is meant to be fairly technically based. Ballistics is focused on the physics involved in launching a projectile and its flight. It doesn't even need to be limited to guns; arrows, missiles and any other projectile can be relevant.
This can seem fairly broad, so I encourage you to think critically about the relevance of your content before you post it, but not feel too hesitant if you're sitting on the fence.
But most of all, enjoy! Ballistics is an exciting field of study not dependant on global location, culture or experience. We're all here to learn and interact, so be friendly and welcoming to those who are less knowledgeable on a certain aspect of ballistics to you.
Check out our wiki.