More information needed:
Update your post to include full system hardware specs and OS information.
Do you have the applicable User Guides/Manuals for the motherboard, case, and all other components that are to be installed?
What is causing the confusion: 3 pins vs 4 pins, what connectors/connections to use, what cables to use?
RGB for fans, RAM, general decoration....? Programmable to change colors, patterns, and so forth?
Try to figure out what you can, sketch out the connections as you understand how they should be based on the documentation.
Key is to make the question more specific.
Start with the motherboard's User Guide Manual. Motherboard manuals often list all connection ports and the intended usage.