Dinosaur Escape [0] if you can find it, it's basically a cooperative memory game but introduces them to some very gentle strategy. (Incidentally, there's a similarly themed game[1] on BGA that is also good.)

King of Tokyo is very fun, and it's easy to slim down the rules for someone who cannot read. It still allows them to understand the mechanics and make decisions about which dice to pick and which to re-roll.

Similarly, we started Kingdomino with simplified rules (no multiplication, just a tile matching game) and it was easy to graduate into full game play later.

Outfoxed is a logic / deduction board game that doesn't involve too much advanced strategy. Since it's cooperative it's easy to work with them so they can begin reasoning out the clues.

[0] https://boardgamegeek.com/boardgame/175497/dinosaur-escape [1] https://boardgamearena.com/gamepanel?game=babydinosaurrescue