1–2 times per week is the sweet spot for most creators. More than 2x rarely accelerates growth proportionally but significantly increases burnout risk.
For established channels, posting time has minimal impact since YouTube distributes your video over 24–48 hours. For newer channels, posting during peak hours gives your video the best chance of early engagement.
Yes, but stagger posts by 2–4 hours. Posting on all platforms at the exact same time splits your engagement across platforms rather than concentrating it.