I need to learn how to play keyboard?

I don't think that any website can actually teach you. I would ask a friend who can play, my mom taught me and I taught my brother, so it's not hard to learn or teach. You can learn how to read sheet music from any beginning piano book. All of them teach you, get one and read it, ad it should teach you that sorts thing as well as notes. After that, pick specific easy songs and then learn them from sheet music and listen to videos of them to compare the accuracy.

The action on most keyboards is very different than on a real piano. However, before I bought my piano I practiced on an 88 key kurzweil stage piano (electronic). If you're going to take lessons, most teachers will insist on you owning a piano. You can get a good piano at a good price if you look around. I found mine at a thrift store and I only paid $300.00. It's an upright Wurlitzer, made in the 1950s and it's in excellent shape. So real pianos can be cheaper than electronic keyboards. Also, one problem I had with all the keyboards I've owned is sometimes the electronics degrade and the notes don't work anymore, and I couldn't find anyone who could repair them. Piano keys can be easily repaired but if you keep the maintenance up, they should never be a problem - so pianos actually last a lot longer. I think the only reason for preferring a keyboard is that you don't have the space for a piano, which is a very legitimate reason, but pianos are better for learning, if you're serious about being a pianist. ADDENDUM: Ewelina has a good point. Plus, the dynamics of a piano are different than a keyboard. You don't get the overtones and harmonics on a keyboard that you get on a piano. If you're going to learn to play the piano, those overtones and harmonics are important for the expression you want to achieve, and if you can't get them on a keyboard, you're not going to learn how to develop that expression. Learning to play the piano expressively is as much listening as learning technique. You could learn technique on a keyboard - I did, but it wasn't until I purchased my piano that I learned how to listen to and work with the various overtones and harmonics.

Actually teaching requires an actual teacher. There are plenty of "tutorials" and "follow the colorful keys" videos out there, but they cannot tell you what you are doing right, what you are doing wrong, correcting you in real time and making sure you are progressing at the right pace for you.