What happened in Yahari Ore no Seishun Love Comedy wa Machigatteiru (Season 1)?


I had watched the anime 3 years ago and I don't remember much of what
happened. I plan to start the second season and don't feel like re-watching
the first season.

Hence, I'm looking for a summary of the key events/story of the first season
without any spoilers from the second season (couldn't find it online).

