I posted what I use in that other thread of yours. What they do:
Polishes - remove defects swirl marks and defects if there are not to deep.
Sealant - Protect the paint and should out last waxes.
Glazes - add depth, weetnes and gloss to the paint, and some help tohide defects.
Cleaners/Paint Cleaners - use chemical cleaners rather then abbrassives like polishes do to remove oxidisation etc, giving clean smooth paintwork when used in conjunction with clay. Ideal to use when you dont want or need to use an abbrassive polish. Some are also designed to allow sealsnts to bond to the paint to last longer.
Waxes - also protect paint, as a rule look nicer than most sealants, at the cost of durability, they as a rule never last as long as a good sealant.
For this reason it is good to add a sealant base for protection, and top with a Wax for looks.
Wash
Clay
Paint Clean/Polish
Seal
Wax