I'd say you don't have to spend any money for some of the best classes, but it matters what you're interested in / specialty. Check out OSSU on GitHub for a lot

I'd say you don't have to spend any money for some of the best classes, but it matters what you're interested in / specialty. Check out OSSU on GitHub for a lot of really good free courses. Only time I'd recommend spending money is if there a specific course within a specialization