This is coming from a guy, so I don't quite have the perspective from women. Don't be surprised if there seem to be a bias. I can find good advices out there, but it's very easy to find well formatted articles talking about the topic like the writer is spitting facts with their bullet points. Keep in mind, everyone writing on the internet do so for a reason. It might seem like the articles were written to help you, but it is often not the case. Many of the writers couldn't care less about you. They don't even know you exist. But they care about their own opinions. And this is why they are voicing them. Helping you is probably not on top of the priority list.
That being said, you can still navigate and find the good stuff out there. Just stay away from headlines such as "How to Win her/him Back in 10 Easy Steps." Those will proceed by explaining how to exectute emotional manipulation so she/he gets back "crawling" at you. What they won't tell you is, most women/men are not stupid. They will see right through it. And they won't ever talk to you again. Probably. Why would acting selfishly and being a poor listener to her/him work? I can almost guarantee you those writers aren't in a happy relationship and are probably bitter themselves. They are writing probably because they want the world to get down at their level. And the internet is the best place to do so. The alternative is, they have some links to subscribe to their packages that will give you their ultimate secret to win her/his heart back. In this case, they know exactly what they are doing. And they are helping themselves. They know you won't get them back, but at least they can feed off heartbroken people until those finally move on. Just opportunist assholes.
Other articles are going to give you reasons why your relationship failed. Of course, they know absolutely nothing about it, but they won't admit that. They are going to throw "facts" at you, such as: She lost respect because you didn't act like a "high value" man. By that, they shamelessly explain a high value man doesn't show care for his woman. And that is going to make you look valuable to her eyes and build attraction. Acting like a price to be earned. Basically, they are explaining how to make a toxic relationship work by playing mind games. Do you really enter a relationship for the purpose of having a trophy person by your side? Many do, but I imagine many of you are looking for something genuine instead. They are also often of the opinion you should treat a woman by pushing her for sex. Because otherwise, you're treating her like a little girl instead of a grown woman. And that is why she turned you down. I don't think this should pass your quality content filter. Otherwise, you'll feel like you are not allowed to have a genuine connection with someone, and you might give up on the whole deal. Again, don't fall for it, they want you to get down to their level for their personal satisfaction. Those writers are sexually frustrated and those articles are just their way for them to vent online. They know nothing about your situation.
I have so many examples, we can discuss it further in the comments. I'd be happy to analyze concrete articles from links. The bottom line is: if you're feeling down after a rejection or a breakup, you are probably going to be tempted to find easy answers to relieve the pain. And the internet is absolutely not your friend. It is full of "know it alls" who really know nothing. Have you ever been in the subreddit r/relationshipadvices? People there are voicing their uninformed opinions. They seem to always suggest to end a relationship instead of working it out. Nobody ever seems to suggest the latter. Your partner farted by accident at a gathering? Yeah, you should end your marriage of 15 years... Yet, people go there for answers. Of course, I'm exaggerating, but I'm only conveying the idea. Maybe the reason is, this sub is filled by frustrated people who can't stand seeing people in generally healthy relationships, and will influence people into breaking up for their personal relief. We can't dismiss the idea they have their own interests in mind. Why would they care about you?
Okay, enough words for now ^^ I hope you can rely on a good friend who can really listen and help you find your own answers for your unique situations.