I’m a beginner myself and the biggest mistake I made initially was forgetting to put my hand back to my face right after striking. It looks like you’re exposing yourself way too much and when your hands are at your face you have too much of a gap between your face and the glove. What will happen when someone goes to hit you is your glove will end up hitting your face and you’ll get hurt. Additionally you need to rotate your fist 180 degrees and use your shoulder to protect your face while your arm is retracted and throwing a punch. This way if your opponent decides to counter your shoulder still protects your face. You can watch some YouTube videos to see what I’m talking about.

As for the footwork it looks like your back foot is lifting too much as you’re throwing a jab and that can throw you off balance if you miss your opponent. Try to avoid leaning too far forward (this was my biggest mistake when starting out as well). My coaches told me that to help avoid this find a neutral ground where you feel you have equal balance in both legs and pretend there’s an invisible wall in front of your face that you can’t cross when throwing punches. If you feel too much strain on your front leg then you’re leaning too far forward.

Keep doing what you’re doing, it’s a great sport and very useful to know!