Oh my.... I'll just add in the most important stuff because some of it is just filler
Twilight Sparkle moves in Ponyville, meets others: Applejack, Rarity, Pinkie Pie, Fluttershy, and Rainbow Dash (WHO IS BEST PONY IN MY OPINION) and then stops Nightmare Moon from making eternal night (that would actually be fine if we had eternal night imo) and then NM turned to Luna and said "omg sorry" to Princess Celestia
Friendship problems happen then are fixed
They fix some friendship problems and meet a villain named Discord. He makes a screwed up world but is later turned to stone. More friendship stuff.
Then there's a wedding for a Princess named Cadance and Twilight's brother. Cadance was actually locked up in a secret jail by an evil queen named Chrysalis, who can change into other ponies. She disguises as Cadance, Twilight finds out, and then DA POWER OF LOVE beats Chrysalis.
Friendship problems continue, get fixed
There is an evil guy named Sombra, there's a lot of crud happening, a lot of GAK commercials, and then Spike the baby dragon beats the freaking demon.
Discord comes back and he is turned good by Fluttershy
Twilight becomes a princess
Some tree thingy screwed up because reasons and is fixed
More friendship stuff and some cool stuff
Twilight meets some demon thing named Tirek and he takes energy from ponies. Discord works for Tirek because of power, but is betrayed, but is their friend again. Power of friendship makes them all rainbowy for a few minutes and then Tirek is turned to a tiny old man and locked in a prison.