Is there any way that the players health can't exceed a certain number. Say if you have a total of 150 health and you are at 100 and when you use a potion you gain back 75 health.... could you make it so the health afterwards would stop at 150 instead of being 175/150

Here's an example if the current health is a variable and the max health is a property:

if (%currenthealth% > $Objectproperty(objectname;health)$) { set <health; $objectproperty(objectname;health)$> }

There are also things called status variables - which will automatically kick this type of script off - if you put it in the right place...

Hmm, if it's the player's health that makes sense. I usually have to keep track of a few dozen at least so that's not too useful.

Yeah, an enemies health should be checked after every 'turn', which damages the enemy.