Hey anyone have any advice for me to improve my snowboarding?
I'm a beginner, I know the basics and I know how to go down a slope but I don't take lessons and I don't do them often so when I do I would like to learn how to progress faster.

I wish I could say I could help, but the first time I tried 10 years ago, I broke my shoulder and haven't snowboarded since...

Ow- That's too bad, How you broke your shoulder ??

iirc, I was going down a steep slope (that the signage said to not use, so my bad..), then I tried to stop by falling on my butt, but as I did, I bunched up a heap of snow and flew through the air, did a flip and a half and landed weird.

Although, I wanna say, my response was not particularly helpful, as someone who's been skateboarding for awhile I might have two pieces of advice, even though they're not exactly the same, there's definitely some crossover.

(1), you can't do what you can't picture. So picture what you want to do. This might sound like it goes without saying, but you'd be surprised, for example, if you're going for a jump, don't just throw yourself into it, instead, picture hitting the jump, picture holding your body in the air, and picture landing; what do you need to do? How much will you bend your knees? Etc. Visualization is a huge part of these kinds of sports.
And (2), this might apply more to skateboarding, but if you do fall, try to dissipate your momentum as much as possible, impact happens from losing momentum too quickly, if you're able to tumble at all, do so, even if it feels clumbsy, slowly dissipating your momentum means less momentum hits your body.

Oh and one more thing, less of a tip, but worth noting. KEEP AT IT! You'll get better and better as long as you want to! Best of luck c:

Wow thank you very much! I'll think about it when I snowboard!
There are also a lot of people who skateboard, it's really cool, I would have to give it a try.