When you download Fusion 360, you'll see that it comes with a 30 day free trial. This trial is for the full commercial license. However, Fusion also offers a personal/hobbyist license that is for free.
It's important to know that you cannot secure the free Personal Use license until the 30 day trial to the full software has expired. If you're still within the trial period, you may want to bookmark this page and come back once the trial period expires. Follow the steps below to secure your free Personal Use License. I've also linked a step-by-step video below.
If you prefer to read the steps, here they go:
Go to the Fusion 360 for Personal Use home page.
Scroll down to the "Activate Fusion 360 for personal use" section and click on GET STARTED.
Sign in to your Autodesk Account. If you don't have an account, simply click on CREATE ACCOUNT.
After signing in, you'll be taken to a new page where you'll see "Download and install Fusion 360". Click on the link to download fusion 360 for personal use.
*Important* Even if you have already downloaded and installed Fusion 360, you still have to click on the link. This is what triggers Fusion to update your account.
Sign out of Fusion 360 and wait 30 minutes for your account to update. Then log back in.
You should now see that it says "Autodesk Fusion 360 (Personal - Not for commercial Use) on the top toolbar.
Here is the step by step video
Quickly get up and running with Fusion 360 by enrolling in my Quick Start Mini Series.
My big aha! moment with Fusion 360 happened when I finally understood how to use Constraints. Get my free Fusion 360 Constraint Cheat Sheet and see what I mean.