On the advancement trail, a Cub Scout progresses from rank to rank, learning new skills as they go. Each of the ranks and awards in Cub Scouting has its own requirements. As the Cub advances through the ranks, the requirements get more challenging, to match the new skills and abilities that they learn as they get older.
The Guide to Advancement can answer your questions about the mechanics of Cub Scout advancement.
Use Internet Advancement to enter youth advancement and awards. This makes sure that Cubs get proper credit for their achievements. You can print a report to make it easier to buy your rank emblems and awards, and you can run a Unit Advancement Summary to see how your Pack is progressing.