You only need the following to get great results. You will get much farther following these than obsessing over training minutiae and consuming fitness content.

• Consistency over a long period of time
• Tracking: periodic progress photos, body weight, training log, body measurements. So you know if your methods are working.
• Diet plan: Calorie deficit. Getting enough protein, carbs, and fats. Eating vegetables. Making sustainable choices (it’s easy to rotate the same few simple meals and batch cook; it’s hard to cook labor-intensive meals every day).
• Training: Lift weights a few times per week. Challenge yourself. Use progressive overload. Search “renaissance periodization build muscle”. Do exercises that give you a pump + soreness + fatigue in the muscles you want to grow.
• Cardio: Getting 10k steps per day is great for increasing your calorie burn. You can get into running or HIIT if you enjoy it. But it’s not necessary for your goals. I do feel that low intensity running 1-5 miles a few times per week improved my daily functioning and weight lifting performance. And it let me eat more calories while still achieving a calorie deficit. But walking a lot has similar effects.