So many! I play tetris on the tetris website, wordle on the nyt site
Then on Steam (games hosting progamme) I play:
Quilts and Cats of Calico - board game translated to PC game
Risk- again, board game that's been made into a pc game
Skyrim- Role playing open world game where you explore, do quests, kill things, make friends, hunt dragons- this one is complicated until you learn the game mechanics, but there are lots of youtube/ online tutorials etc for it.
What Remains of Edith Finch- a story based walking game where you follow the story along and explore in a linear fashion, you mostly follow the games instructions and see where the linear story takes you.
Spiritfarer- described by the makers as a cosy management game about death, you take over from Charon to ferry souls across to the afterlife but you also fish, and farm, and cook, and explore, and get to know the residents on your boat.
The Sid Meiers civillisation games are fun and relaxing too, you build a civillisation and beat the AI civs to take over the world. Civ 5 and Civ 6 are available on Steam.
Minecraft is also easy and chilled and fun to play, and is for all ages, I enjoy spending a couple of hours here and there playing.
Sims 2 is available online, if you go to Sims2help subreddit there are instructions to "find" it for free and install it. Or if youd prefer to play newer version, Sims 3 and 4 are both good too.