You will find you can learn Spanish fast online for long as you are self disciplined and you make sure you get the fundamentals down before you move onto anything more advanced. you Will need to find a website you’re comfortable with. You’ll need one that is easy to navigate, one that has some kind of lesson structure, one that will allow you to learn basic Spanish online before moving to more advanced lessons and you’ll need one that allows for you to physically hear how the words are spoken therefore that you can learn the correct way. Once you find a web site you like, you’ll be able to learn Spanish fast online. How fast you learn, however, is totally up to you.