Reading text-based instruction is more efficient than watching video instruction (except for content that is difficult to describe in text)
To increase shoulder strength, pressing movements push farther more efficiently than lateral raises
If you want to build muscle quickly, don't bother with bodyweight, resistance bands, dumbbells, or weighted vests. You should buy a power rack with a barbell, and ensure you add weight every training session, even if it's just 1 kg. After two to three months of squatting I could squat 70 kg for 7 reps, which already exceeded my body weight at the time. Be sure to buy a power rack; see for details:Home gym & fitness pitfalls