There's lot of free ways to learn more about blockchain, however, we need to know what you're aiming to learn.
Are you trying to learn about how cryptocurrencies work in general?
How blockchains are being used?
How to code within a blockchain?
Etc
We need to know the area you are looking to explore.
agree with you. a lot of free ways to learn blockchain. many information in internet and i think this forum very complete. you should to explore this forum and will get more information about blockchain. if there is a free ways why should to pay for courses? but its their respective ways