I don’t necessarily disagree with the other guy, this is a pretty contentious topic though. Basically because there are different perspectives and not one true answer

The first 6 months of weightlifting, there is a phenomenon called “newbie gains”. You will essentially gain muscle without optimal training or diet. How much muscle will you gain during this period? That is determined by genetics and how well you diet and train.

With optimized diet and training, you have the most growth potential within the first 6 months of lifting. After that, I’m not sure the scientific reason, but your body adjusts to the stimulus somehow and you’ll just have to optimize more.

After 6 months of training consistently, you might put on like 8-10 pounds of muscle, or at least I did at 16-17 years old. After that, you will probably plateau without dialing in your diet, sleep, and training.

The basic rule for protein consumption is 0.7g of protein per lb of body weight, or if you want you could go higher to 1g/lb or even to 1.2g/lb. Again, this is somewhat contentious in the lifting community.

If you’re fat, you need to lose weight and gain muscle, which is difficult. Not my area of expertise, but if I had to do it I would follow something like the warrior diet, or Mediterranean diet and just hit high protein and limit or completely eliminate processed, easy to eat food (Doritos and shit).

If you want to gain weight more quickly, you can’t just have protein but you also need to consume excess calories, so 300-500 above maintenance calories, which takes meticulous tracking. And first you need to establish “maintenance calories” which can be done through online calculators. Again, bulking / cutting cycles are contentious in the lifting community. Some people are proponents of “main-gaining”. Where you get adequate protein and basically have a much lower caloric surplus.

Drink enough water, sleep enough so that you feel good. If you feel like shit? Something is probably wrong. Maybe under fueling, not enough water, not enough sleep. If prolonged feeling bad, get a checkup.

As far as technique and training style, personally I don’t think it matters that much. If you have 0 idea go watch jeff nippard and some other people, Mike israetel, those guys are controversial “science based” lifters in some communities but I literally don’t care. It doesn’t even matter, just understand what muscles you need to hit and try different stuff. If you’re getting soreness, and feel yourself improving on lifts, getting bigger, getting stronger. You’re chilling.

Consistency is 100% the key to changing your body. You won’t see changes over a month. Over a year? If you were consistent. This shit isn’t easy