There are only 5 „Major“ competitions world wide?
This is similar to the Tennis world ranking system.
The others categories are: Grand Prix, International Open and Satellite competitions. The Golden Grand Prix is for special events or anniversary tournaments. You can apply for a GGP and you can read more in the FISTF handbook.
Each of the above categories will supply you with world ranking points and you can qualify directly for the World Cup. If you are in the Top 8 in your category per 15th May of the WC year, then you qualify automatically. Study the FISTF Handbook.