KW is right, those tutorial on youtube are more aimed at the people training already who can get an idea and go and work it. The problem with learning BJJ online is that 1/4 inch is all it takes for the difference between success and failure adn trust me if it is a failure it just drains the fuel tank and leaves you running on empty.

Go and learn from a credible instructor and academy

Tutorial videos can be a good supplement to training, but it's impossible to actually learn BJJ or any other style online, free or otherwise.

Youtube has plenty of BJJ tutorial videos

Still, I highly recommend joining a BJJ school than learning online

Get a usb port put in the back of your head.