to walk in a strait line you can use "W" to walk foward, "d" to right, "a" to left and "s" to walk backwards, these are the basics.

now if you want to become a master of walking, you need to learn how to walk in a diagonal, to do this you need to combine two keys
for example: a+w.

all combinations: w+a, w+d, s+a and s+d.

never ever use combinations like these: a+d and w+s

now if you get everything from here, you need to know a secret, if you press the key "shift" you will walk foward but faster. this mechanic is known as "running" that is so complex that i cant describe it here, in this mortal world.