I am very new to digital painting and I own a macbook. I use a wacom bamboo one and the driver is installed and everything. If you toggle the openGL on and off it does nothing, and if you turn it on and then draw your line doesn't show up on the screen until you lift the pen off the tablet and draw another line, but the pressure sensitivity does work there, even though it's kind of minimal. Help, please? Thank you so much for your time

In general, OpenGL is only about displaying stuff. Sadly, MacOS is giving the devs a really hard time when it comes to OpenGL, so a lot of code has to be re-written so that everything works properly on MacOS. That's what makes the line so problematic.

On the other hand, OpenGL will not cause any change to pressure sensitivity. So at least you don't have to fiddle with turning it on or off to figure out the pressure problem.

There's many things that influence how pen pressure changes the way a pen works. Almost all of these things are per-brush, so if you select a different brush from the presets, you'll get a very different experience.

That said, there's a setting in the wacom driver (no clue where you can find that on a Mac; probably in some "control panel", "system settings", or similar) where you can configure how hard you have to press the pen down to reach "full pressure".

On top of that, in the krita settings you can find the "tablet settings" where you can configure a "input pressure global curve" that influences pressure across the whole program. Normally, it's just a straight line from the bottom left to the top right.

If you have trouble getting very light strokes registered, you will want the curve to start out kind of shallow from the bottom right and then become steeper towards the right. If you have trouble reaching the maximum pressure, you'll want to make the curve go up steeply and then shallower towards the right, or perhaps even reach the very top before it reaches the right end.

After that, you can open the brush preset editor. It's on the F5 key (at least on linux) and it'll allow you to see the exact configuration of your current brush. Look at the little list that starts with "General" kind of towards the middle of the window. It has things like Opacity, Flow, and Size. The first two of those can't have a checkbox, but many others can. When you check out all those that have a checkbox, you can see whether or not (and how strongly or weakly) any given property of the brush gets influenced by pressing harder or softer.

I hope that kind of helps?