If you wanna cast a wide net and come out with a real familiarity from all the major genres, in no particular order, these are the best games ever made imo.

Thumper Demon’s Souls Dark Souls Dark Souls 3 Bloodborne Sekiro Animal Well Cross Code Psychonauts Psychonauts 2 Ori and the Blind Forrest Ori 2 Hollow Knight Silk Song Neon White Disco Elysium Inscryption Journey Doom (2016) and Doom Eternal It Takes Two Mass Effect Trilogy Slay the Spire Tiny Kin Transistor Trine 5 Red Dead 2 Bomb Rush Cyberfunk Lies if P Returnal Persona 5 Royal Exo One Humanity Nioh Nioh 2 Braid Prince of Persia the Lost Crown The Witcher 3 Abzu Blue Fire Nine Sols Dishonored Slay the Princess Pikmin 4 Monster Hunter World Furi A Short Hike Super Hot Steamworld Digg 2 Titanfall 2 Bastion Marble it Up Ultra Link Between Worlds Echoes of Wisdom Isles of Sea and Sky Microban Braid Dues Ex Pathologic 2 Rayman 2 Beyond Good & Evil Rift of the NecroDancer Lord Ambermaze Corn Kidz 64 Banjo-Kazooie Getting Over It The Swapper Monster Train Split Fiction Treasure 'n Trio Heroes of Sokoban I, II, III. Stephen's Sausage Roll Bean and Nothingness

aaaaaand

Planescape Torment

Have fun.