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[Suttebun]

https://zackbellgames.com/  

There's some great write-ups from an old Tigsource user that I think you new gamedev peeps should checkout.
My favorites are his gamemaker Platformer and Collision tutorials.

Understanding Collision Basics

Creating A Platformer

He goes over some decent game architecture bits that can really ease a game's overall development.
  >Solid(collision) Game Object Parent
  >Moveable Object Entity Parent

These sort of things can be rough to grasp at first.

- - -

Also.. Setting up keys to move the game back-and-fourth between the game's rooms.
That's some Grandma Engine madness right there.

[Suttebun]

A fix for the second platformer tutorial..

Things to note, collision will not be noticed until..

// Relative collision checks
cLeft = place_meeting(x – 1, y, oParSolid);
cRight = place_meeting(x + 1, y, oParSolid);

is placed in the step event.

And sticking will not stop until you create the alarm event to stop it. Create the Alarm 0 event, add..

sticking = false;
alarm[0] = -1;