I am glad you're having fun with the lesson and I'll do my best to help you here
As I see in the video, your rest stroke is just fine, just keep on imitate like this
, it is visible that you make effort to play it but over time it will became effortless. Pay attention when you move on the lower string to alternate index and middle fingers, not to play two strokes with the same finger.
Tremolo technique requires practicing, try this: set metronome to 80 bpm and play each note of the tremolo with each beat (or even slower, it is important that you play it easily), and then gradually increase the tempo. In this way it is less likely to play outside the tempo and it will help you to build the technique. Later on you can set the tempo that one beat correspond the four strokes, and at the time your timing will be correct.
Regarding nails, try to shape your nails to prevent hooking, they do not have to be too big, it is enough to have them slightly above the flesh to catch the strings. But as I said, keep on imitating me and keep the nails parallel to the strings.
Overall it sounds good, and I must admit that you have a good sensibility for music. You can feel it very well, but the technique is still preventing you to achieve the full potential so it is just a matter of practice. Another-words, you know how it should be played but your fingers are not obeying you completely.
I hope I answered the questions, if you need any additional help feel free to ask
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