[website] I'm a beginner, it's all too complicated for me
Ultimate Guitar Pro is a great tool for beginners! You can slow down the speed of a tab, loop a particular part and practice it at a pace that you're comfortable with.
Here's a great guide on how to read Tab Pro tabs.
And here's another guide on how to learn 'Stairway to Heaven' Intro in 20 Minutes.

What are the lines for?
Lines stand for guitar strings.
The top thin line signifies the first string.
The bottom thick line signifies the sixth string.
Lines stand for guitar strings.
The top thin line signifies the first string.
The bottom thick line signifies the sixth string.
What are the numbers for?
Numbers indicate which fret you should hold down the string.
So a line with a number on it indicates a string pressed on a certain fret.
0 means that it's an open string.
It's as simple as that.
Numbers indicate which fret you should hold down the string.
So a line with a number on it indicates a string pressed on a certain fret.
0 means that it's an open string.
It's as simple as that.