@michaelkallio09 Welcome to the forum my friend! Can you please elaborate on what definition of cross-harp you came across? I’ve never heard of any other than it being another word for 2nd position, meaning playing your C harmonica for a song in the key of G
I’ve organized Beginner to Boss Module 3 into blocks of songs that fit into 1st, 2nd, 3rd, and 4th position. You can see that fairly easily in the table of contents, or here:
Learning the scale of each position will help give you a framework for each position and is worth the time, especially for 1st and 2nd position which are the most frequently played positions.