Does KDE have a way to get windows snap?

I like win alt up, so that it maxes out your window up and down

Look in System Settings → Shortcuts and do a search for words like “max” or “window” to find the maximizing actions configurable or all the window related actions. By default it is META+PAGE UP/DOWN to cycle through minimize/show/maximize.

PS: META is the WINDOWS key

META+UP/DOWN/LEFT/RIGHT can move the window and/or put it in half/quarter screen size too… many other shortcuts to configure to your liking in the System Settings → Shortcuts menu.