Many are true and I'm sure many are exaggerated and even false. The thing is, with any method you find here, you can expect that it won't work for you if you just copy it word for word. You almost always have to tweak it.
Take all the Instagram methods for example. It is true you can make some Ching with IG OG but no one really tells you how to definitely make your links stick and avoid bans (the sollution is simple btw). But you have to figure that out yourself or you will fail.
It's the same with most methods. There is usually always some small (not so small) points ommited either purposefully or not. It's up to you to figure it out.
How? Common sense, creativity and most important, test test test. You have to get in there and get your hands dirty trying different things until you find one that works. Then when you do, scale it up as much as possible.