u/Studying-Ghost

As the title says, I'm a heritage speaker and was never formally taught Romanian. I can speak it pretty well (albeit with mistakes, but my family says it's very understandable), my listening comprehension is solid, and I can figure out what a text says with some concentration, but I have absolutely no knowledge when it comes to grammar and writing. I would appreciate any advice/tips on what I can start doing to improve. Thank you!