Rubik's Cube is a mechanical puzzle invented in 1974 by Hungarian sculptor and professor of architecture ErnQ Rubik. Originally called the "Magic Cube" by its inventor, this puzzle was renamed "Rubik's Cube" by Ideal Toys in 1980  and also won the 1980 German Game of the Year special award for Best Puzzle. It is said to be the world's best-selling toy, with some 300,000,000 Rubik's Cubes and imitations sold worldwide. For more info, click here
Step 1: The Notations
Before you can build a rubik's cube, you first need to identify what is the parts. There are:
D-down or lower face
All of them to be turned clockwise, except they have apostrophes after the letter, like F', you should turn the front face counter clockwise.and if you had U2, you should turn the upper face twice, regardless on the way of turning. if you are given R'DRD' , you should turn the right side counter clockwise, down side clockwise, right side clockwise, and down side counter. Well, do this ''algorithm''6 times on a cube in solve state, you'll make it solve again. Trust me.
Step 2: The cross
Since you already know the notation, let's begin the cubing. You first need to have the cross on one face. this will be your base.And the cross should be right in the other colors.
Step 3: The first layer
After the cross you should make the first layer. if you think these both steps are difficult and worrying on other steps, take a break. the other steps will be easy. If you had made the first layer, it should have the T-like on the other color
Step 4: The second layer
now, things should be done easier. you are now building the second layer. You should align the colored to the piece where it is supposed to. if you had the first picture as your state, do this algorithm on the side where is the missing piece. In my state, i should face on the white.
and on the vice versa, do this:
do this until the whole second layer is solved.