In addition, the key to gaining muscle is the basic diet, which is your three meals. If the calories and protein of three meals are not enough, just eating a few spoonfuls of protein powder will not have a good effect.
For a novice like you, developing training habits, developing correct posture, making a plan that suits you and strengthening the basic diet are four key points. It is useless for you to ignore supplements such as protein powder for the time being.
In the words of Mr Yates of Olympia, training attitude is the key to bodybuilding.
I hope novices don't believe in tonics. China's early bodybuilding champion, Yu Yushan and others, had never seen protein powder when they won the championship. You can search his photo.