New beginner Windows Adobe user

The shortcuts are all the same. The Alt key on Windows machines is the same as the Option key on a Mac. The Ctrl key on windows is the same as the Command key on a Mac. I've never seen a tutorial that would not work on either platform. 

When you look at tutorials, you need to make sure you vet the people giving advice. Unfortunately, most of the tutorials you will find with a simple search have been prepared by enthusiasts. Many of the recipes they are sharing have inefficient and sometimes incorrect workflows. Make sure they know what they are talking about. 

Your best getting-started workflow would be to open the Learn workspace (under the Window menu) and go through the UI. Then use the User Guide from Adobe. You can find it on the After Effects product page at the head of this forum. or by using the Search Help field in the top right corner of After Effects. 

When you have a specific question or a problem with a tutorial, be sure to include screenshots of your comp with the modified properties of the problem layer showing. Select the problem layer, press 'uu,' take a screenshot using your system shortcut key, copy the file, then paste (Ctrl/Cmnd + v) to the reply field on the forum or use the Toolbar to embed it. If the problem is with a tutorial, include a link to the tutorial.

After Effects can be overwhelming, and it takes time to figure out the UI. There are dozens of different approaches to the same animation or compositing problem. It takes a while to figure out which approach is best.

Good luck in your AE journey.