Glad you asked!
With all the different products out today, it can definitely be confusing on deciding what product is right for you. I will start by saying that I only use 3 brands of detailing products; 3M, Meguiar's and Mother's. And my preference being in that order. But there are many different types of detailing products, and they all serve a different purpose.
Waxes: Wax is what seals and protects your paint and helps give that deep gloss. Carnuba wax is always a good one. Typically easy to work with, fairly long lasting and cost effective. I recently have been using Meguiar's Ultimate synthetic wax. Extremely easy to work with, as it can even be applied in direct sunlight, and leaves an amazing shine. A little more expensive but worth every penny. There are other types of waxes as well, but in my opinion are a waste of money. When using wax, work in small areas (on cars) like a single panel at a time. Apply the wax in small circular motions using a little bit of pressure, but no elbow grease. Allow the wax to just start to dry to haze and buff off with a clean microfiber towel. Always wax a vehicle in the shade, do
NOT wax in direct sunlight! Always make sure your applicator sponge and microfibers are clean and free of dirt so you don't scratch the paint.
Detailing Spray: This is an amazing product and a must have in the detailing arsenal. Detailing spray is a unique liquid polish designed for up keeping your shine. It is perfect for removing dust, pollen, rain spots, and
minor road grime. It's what you use to keep your bike tidy and shiny between washes. Simply spray on the surface and wipe dry! When wiping down the panel, use one side of your clean microfiber towel for the initial wipe, then flip to a dry section of your towel and wipe again for a streak free finish.
Rubbing Compound: Rubbing compound is an aggressive, gritty paste used for removing sand scratches after wet sanding, restoring hazed painted and removing light scratches. It should only be used with a high speed buffer and with proper training. If you are unfamiliar with using a high speed buffer, please watch some youtube videos 1st as it is quite easy to ruin your paint job if you are not careful.
Polish: Polish is a more liquid version of wax designed for use in high speed buffers. It can also be applied in the same fashion as wax by hand, but is specifically designed for use after using rubbing compound.
Metal Polish: Much like rubbing compound, but designed for polishing metal. There are different grades of fineness for metal depending on your needs, the type of metal, and the level of corrosion present. Read labels carefully when selecting the right polish for your needs. I prefer Meguiar's Medium Duty Metal Polish for light to medium corroded aluminum and NevrDul wadding polish for cleaning up chrome.
Clay Bar: Clay bars are a great tool for vehicles with older paint, and is just what you think, a bar of clay. It is used for removing oxidization and surface contaminates that are bonded to the paint. If you have ever run your fingers or a towel across a paint job and it is feeling gritty tho it is clean, this is the tool to get it smooth again. To use, wad and knead the clay in your hands until it is flat and warm. Spray the panel to be cleaned with detailing spray and work the clay bar in circular motions across the paint. Keep the surface well lubricated with the spray and continue to knead the clay every couple of minutes. As you go across the paint, you will feel the clay bar move easier and easier. When the clay is completely slick in that area, the surface has been decontaminated. Make sure to apply a fresh coat of wax after clay barring to seal the paint again.