I'm a newbie just getting into Blender and I'm following a tutorial that was filmed using 2.8 in beta. In the tutorial, the author is doing CTRL + R and mouse wheel to change the number of cuts but it's not happening in my official 2.8 version of Blender. Has this changed when 2.8 came out of beta? Also, after he creates a number of cuts, he is able to move the cuts vertically on the Z-axis and I'm not able to.
In a comment you write
I was in edit mode and have selected the loop cut tool, the same tool you have there in the image.
That is exactly the problem. If you have the Loop Cut tool selected in the toolbar, choosing the number of cuts with the mouse wheel doesn't work and LMB does not allow you to slide.
Try selecting the Select Box tool (or any other tool really) and then Ctrl+R will work as shown in the tutorial.
make sure your in edit mode (press tab with the object you want to edit selected), and you need to have your mouse over the area you want to make the cut with. It hasn't changed when it came out of beta. There is also a button on the left side for this in edit mode, if you don't like using shortcuts. The image of it is below. And if for some reason you can't see that, press T to toggle the tool bar on and off.
There are now two ways to loop cut. The best is still to use the shortcut Ctrl + R, using this method the scroll wheel will adjust the number of loop cuts.
If you are using the toolbar button to loop cut then the scroll wheel will adjust the zoom instead. You can increase the number of cuts using the menu.
You will also need to change the tool back to something else to get rid of the tool. Long story short use the shortcut Ctrl + R not the buttons.
If the Ctrl+R Loop Cut shortcut doesn't work, it might be conflicting with a hotkey/shortcut from another piece of software running on your system. Try exiting other programs and then try the Blender loop cut hotkey again. If problem still persists, you can always assign a new shortcut to the Loop Cut tool.
RMB on the loop cut tool icon in the tools panel, select Assign Shortcut, set it to whatever you want.