Been seeing some threads about working out this is what I've learned & hey maybe if u might get into the gym this will maybe help you:
I started off skinny, had to bulk, and went through a cut (I'm average height 5'9 US)
Starting weight when I was skinny: 106
Starting weight for my cut: 147
When I was really thin I started off doing moderate exercise 3x a week (stronglifts 5x5 routine then switched to greyskull lp routine)
I only worked out 3x a week full body comp to build muscle/strength and had rest days between workout days. I only worked out 3x a week & did the workout routines with added 1 or 2 added exercises & not spend 1.5 hrs - 2 hrs in order to not burn so many calories due to my skinniness. (I feel like a lot of skinny dudes spend way too long burning too many calories that their daily appetite can keep up with)
I also ate at least 2000 calories a day & took in as much protein = to my body weight but as I gained more weight, I added more calories & protein as I gained through an app called myfitnesspal (it may be hard but it gets easier, what helped me was thinking about where I could've been if I started earlier) (it also helps to get weight gainer)
On my cut, I'd eat at a calorie deficit but take in protein = to my body weight still while working as hard as I could. There were moments when I felt really hungry but I drank water instead or ate a protein bar in order to fulfill some of that appetite.
TLDR: stronglifts 5x5 or greyskull lp work out routine free online
skinny: eat more calories (look up calorie to bodyweight calculator & eat more than the calories it gives you while eating as much protein as your bodyweight)
fat: calorie deficit but eat as much protein to your bodyweight and workout as hard (you'll get noticeably weaker but it's normal)
Do it for yourself & own wellbeing.
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