Not OP or AYRT, but starting with getting strong is really starting with the basics. If you don't have the funds for a gym or a personal trainer to get you started, buy a set of dumbbells personal to your strength. I recommend starting with 3 sets, a 'light' set relative to your strength, a 'medium' set, and a 'heavy' set. You can easily build muscle and strength at home with some strong programming, and before long, you'll experience newbie gains and outgrow those initial weights in the speed of light.

Youtube does have a wealth of programmed fitness from great personal trainers for free. You have to know who to follow, though. Not all youtube fitness professionals are equally good. Subreddit r/xxfitness can help you find the good ones if you're interested.