i need an excel expert for comparing two worksheets!

so hey, i have a minijob in a firm, and the manager kinda trusts me. so i have to compare two excel tablets different worksheets! so im an absolute excel beginner, i dont have a small clue about using this programm, but im willing to learn! so i have two worksheets with each having one chart. one has the "project numbers" and the "name of the company" and additionally the "project description". <--- on this one i got every project in which i have ever participated in. on the other list i have all projects numbers in one column and in another the "name of the company" additionally this one has a column where i have written the place where my projects are archieved, line by line. <---- theyre all one on hard drive. i want to compare both tables in the two different worksheets together and create a new table in a new worksheet: example: on worksheet a) i have isd-344-cleaning my room and on worksheet b) i have isd-344-driveE) so if i have this project on both worksheets and now it is going to be posted on worksheet c) as isd-344 with the additional values which just appeared in one worksheet before : -cleaning my room-driveE i want all projects which just appear on one worksheet to be posted in a additional (rest) list on the new worksheet. im extremely tired, i hope someone here understands what i mean. i would also be happy about tutorials and everything that helps me with my understanding problem! i havent tried much so far, since i really dont have a clue about that programm. if someone could point out a direction where i should look for, for tutorials i would be very pleased about! thank you! i havent tried anything, since i really dont have a clue about that programm and its possibilities!