Gamergate is four things.
1. Gamers finding out that gaming journalists weren't being honest.
2. Gamers finding out that SJW's were beginning to leak in to the development of games.
3. Gamers finding out that SJW's were beginning to leak in to gaming journalism.
4. Gamers realizing that journalism and SJW's are cancer.
All of this started with Jeff Gerstman giving Kane and Lynch 2 a bad score. He was fired for it. Another review was made by someone else giving it a higher score. Turns out the company paid for a good review and didn't get one. Read more on the wiki: https://en.wikipedia.org/wiki/Jeff_Gerstmann
A few years later, gamers found out that a "game maker" was sleeping with gaming journalists for reviews. The game in suspect was SJW bullshit. People began to call her what she is: a whore/slut/etc. People called out how unethical the journalists were.
In steps in Anita "For My Thesis I Watched TV" Sarkeesian who somehow became an SJW figure by...? I don't know. She made videos about how there are no good female protagonists? She just sort of showed up. She spoke to the fucking UN about censoring the internet, for fucks sake.
https://www.youtube.com/watch?v=V3m-bcaCVbM
Anyway, turns out she's just a lying cunt with a patreon who never really made the content that she said she was going to after getting a bunch of money from hopeful SJW's.
As all of this is happening, places like Polygon and Kotaku begin PUMPING out SJW horse shit. Articles about how characters like Mario are misogynist, how the NES had no female protagonists, and, in general, showing that they don't know what they are talking about and are also hacks who aren't actually gamers at all. This spiraled out of control and people began to notice that the entirety of modern journalism is 99% bullshit.
It is one of the biggest things that helped Trump win. It is the reason we have so many young conservatives.