Algorithms are letters and sometimes numbers that identify which face of the Rubik's cube you turn and how much you turn that face. It is important that when you are doing a algorithm that you do not turn the whole cube unless the algorithm tells you to. In Rubik's cube algorithms there are six main letters: R represents the right face, L represents the left face, F represents the front face (the face facing towards you), B represents the back face (the face facing away from you), D represents the downer face (the face on the bottom) and U represents the upper face (the face on the top). So if you ever see just one of those letters in a algorithms, you turn that face once clockwise. If the algorithm said R, you would turn the right face once (quarter turn) clockwise. If you see one of those letters with an i or a ' after it is called a prime symbol if it is the apostrophe or its called inverted if you have the i, but they both mean the same thing. So if you ever see one of those symbols after one of the letters, it means to turn that face once (quarter turn) counter clockwise. If the algorithm said Li, you would turn the left face once counter clockwise. Same thing if the algorithm said L'. If you see a letter with a 2 or 180 after it, it means two turn that face twice (180 degrees). It does not matter witch way you turn the face because if there is only four times to turn it until the face is back where it was at the beginning, so if turn the face twice both ways, it will still end up in the same place. If the algorithm said F180, than you would turn the front face twice. You would do the same thing if the algorithm said F2. There are a lot more algorithms in the world than just these ones but these are all the algorithms you need to know to complete the 3x3 using the white cross method.