A note on good form for exercise and why watching videos is not always a good option.
Everybody knows exercise needs to be done with good form to avoid injury, but what is good form ? Good form on and exercise may be different between two people for the same exercise. Form on an exercise may also differ between a bodyweight version and the same exercise under load.
A good example of this is the squat, there are a ton of how to videos online for squat, all of them slightly different and many of them will be correct for the individual recording the video but still be wrong for you as an individual.
Some of the biological factors for squat that will change what good form looks like include, Femur Length, Tibia Length, Hip socket depth, Hip socket angle and torso length. Then there are things to consider like ankle dorsiflexion mobility, bar position and hip mobility. things like mobility problems can be helped over time, but length and ratios of your body do not change so the technique used for the exercise needs to.