In this step, you are going to learn how to solve first layer of the 3x3 Rubik's Cube. The algorithm you are going to learn is the basic building block of the algorithms you are going to learn in the future.
Triggers is the common algorithm of solving the first layer. There are 2 version of triggers shown below.
Basic Algorithm: Right Trigger - R U R', Left Trigger - L' U' L
Solve the First Layer. In other words, you want to have a fully solved white side, but have all of the side colors solved.
YOUR GOAL
Note: If the corner piece you are looking for in on the bottom right corner do the right version, vise versa.
Begin by finding a corner piece on the top layer with a white sticker on it.
Look on its side of the corner piece.
If the edge piece is matching the right side of the center color, perform the right trigger
If the edge piece is matching the left side of the center color, perform the left trigger
Special Case: If the corner piece is on the bottom layer, then you have a special case
If the corner piece is on the bottom right, perform a right trigger
If the corner piece is on the bottom left, perform a left trigger.