I did it a few months back with my (then) newish rescue dog with absolutely no prior training, following advice I was given here. I really liked it because it’s structured (I agree with you about internet overload and not knowing where to start), really short and simple and fun to do. I definitely think it helped my dog bond with me, learn to trust and play with me and want to stay close when out and about. I don’t think it would be enough on its own though, for recall, so I’ve also combined this with rewarding her every single time she looks at me when out on a walk (using part of her daily food allowance) and regularly and randomly calling her back to me 10 times or more a walk (sometimes I put her lead on for a bit, sometimes I don’t). I give her very special treats for this, and only this. She’s done really well. She’s returned from chasing a cat, finding a dead sheep, flushing a deer and being tempted to chase a cyclist, for example, and she never prances around like a twat, just out of reach, when I want to put her lead on. It is a very simple course, and the presenters are insufferably jolly, but I would recommend it.