Making a Game Save hitting a trigger

I’m making a game with levels,when the player hits the finish trigger a “Win” panel appear.How can i make my game saving and the 2 level (and when it’s finished 3-4-5 ecc…) unlocking? (sorry for bad english)

If you are talking about what level you are up to and saving it PlayerPrefs will help
//Setting a playerPrefs

PlayerPrefs.SetInt("Level", 2)

//Getting a playerprefs

PlayerPrefs.GetInt("Level")


//This is how you can use it

if(PlayerPrefs.GetInt("Level") < 3)
print("You cannot access this level");

else
print ("You can access this level");

I tried to make it very simple, and there may be errors. If you want more help this link may help: Player Prefs