Use the Wolfram License Finder to see if your school or company provides access.
You can use the Wolfram Language—the core power of Mathematica—for free via the Wolfram Cloud.
If you are looking specifically for 2022 releases, these were the major versions:
A web-based notebook interface, 200 MB of storage, and 5,000 cloud credits per month for computations.
It allows for non-commercial use, prototyping, and personal projects.
It does not include the standard "Notebook" graphical user interface found in the full Mathematica package. Quick History: 2022 Versions