Detecting map collision

how do i make collision for a 2d platformer i want to make the player collide with the map

https://microstudio.dev/i/gilles/platformerbasics/

https://microstudio.dev/i/microstudio/collisions/

https://microstudio.dev/i/TwiceUponATime/tilemapcollision/

https://microstudio.dev/i/KimsGames/collisionexample/

https://microstudio.dev/i/Loginus/mapcollision/

https://microstudio.dev/i/gilles/quickengine/