In this lesson, you will probably need a real piano as it will involve actually using your right hand to move up and down the keys. You can go through this lesson without a piano keyboard but if you're a beginning student, it may confuse you.
For these online lessons, you will only use the right hand. If you further decide to develop your piano skills privately, you will use your left hand to play. That so-called standard position is when your right thumb is placed on the middle C, your index finger on the D, middle finger on the E, ring finger on the F and your pinky finger on the G. Why don't you go ahead and play these notes:
You play the C with your thumb. Then use your middle finger (not in that way!) to press the E. After that, use your pinky finger for the G, the index finger for the D and the ring finger for the F.
You can probably see the limitations by placing your fingers in standard position and leaving it there. You can't play the other keys because you don't have twenty hands! That's why you have to shift your finger around. For example, look at the following two measures.
How are you going to play the higher B and C? Here's how you do it. Read this carefully because it's very important. When you get to the E, leave your middle finger on the E the move your thumb to the G. Press the G with your thumb. Then, with the middle finger, play B and use the ring finger for the C. Once you get back down to the G, you must shift your hand back down to standard position. To do this, leave your thumb on the G and move your middle finger down to the E. You're done! Go on to the next page to continue this lesson.