Geogebra & Excell

I've been looking around on the site for a few minutes not coming across any guides on either excell or geogebra. and i know for scandinavians in generel atleast these two programs make up around half the exams from 10th grade throughout highschool 1st to 3rd grade. (i think highschool is equivalent to 11-13th grade) 

i would really love to see a simple tips&tricks video, a way to become familiar with these mathematical programs. 
let me know what you guys think :)