- do a linear progression barbell training program, like starting strength https://startingstrength.com/get-started/programs this is definitely easier in the gym because you need a rack, barbell, bench and weights. But if you want to buy it yourself, just make sure you get the "real" barbells, which weigh 20 kg and have rotating "sleeves" at the end which have 50 mm diameter. This is the standard size, the thinner ones are crap.
- do bodyweight fitness (https://reddit.com/r/bodyweightfitness), this does not require equipment except a pullup bar and maybe some gymnastic rings
- do a linear progression barbell training program, like starting strength https://startingstrength.com/get-started/programs this is definitely easier in the gym because you need a rack, barbell, bench and weights. But if you want to buy it yourself, just make sure you get the "real" barbells, which weigh 20 kg and have rotating "sleeves" at the end which have 50 mm diameter. This is the standard size, the thinner ones are crap.