For a smart configuration, try out the templates below. Then edit everything as you like.
Create groups here. Each participant must then join a group. You can use rankings for groups. Do you allow team creation (see above)? Then all people in a team must come from the same group.
Add at least two groups if you want to apply the groups option
Create categories for an additional dimension here. Each participant must then join a category. You can use rankings for categories. Do you allow team creation (see above)? People in a team can come from different categories.
Add at least two categories if you want to apply the categories option
Your Contest can contain various rankings. Set them below.