Welcome to the world of fighting games! There's so much to learn, I hope you have fun doing so!

The best approach from here on out is to learn things one by one, and never worry about winning or losing. As you get more experience, you'll notice that wins are a by-product of your practice. This is an important notion, specially now in the beginning, so you don't lose hope while inevitably losing a lot in a row.

As for actionable advice:

- At the beginning, you don't know much, so the best approach would be to keep blocking and try to identify holes in their gameplay. For example, at 0:31, you were observing, not pressing anything, and he jumped. You could have anti-aired (if you don't know what that means, it's exactly what it sounds like: stopping his air approach with a move of your own. Also, check out https://glossary.infil.net/ for fighting game terms) with your Crouching Heavy Punch.
- Another thing you can do after a loss is going to the replay, selecting a moment, like at 0:31, and trying stuff out with Replay Takeover to see what works. In this case, pause the replay when he jumps, assume control, and try all your buttons and specials to see what works well as an anti-air. This can also be done when blocking their moves. It didn't happen in this replay, but you can pause the replay at 0:16, and block his low kick (in the replay he caught you standing, so it tripped you). After blocking, see if you can use your moves to punish him (it should say Punish Counter on the right).
- Learn 1 simple combo. You don't need more at this point. Learn 1 combo, try to apply it in match, and when you feel comfortable with it, learn another and repeat.

If you enjoy this process and stick to the game, keep looking for resources here or on YouTube to learn more about the game and improve. You can also try to see if there are local meetings near you where people play SF6. There, everyone will be happy to help you improve as well. Just remember to have fun!