What forms of advertising can you perform on Amazon? Also, how do you decide when and what products to use them on?
You can run many types of Amazon PPC for your listings or products. The most common would be Sponsored Product Ads, these are advertisements based on search terms. This is the type of advertising that you have the most control over and the most direction over your spend.
You can also run Product Placement Ads, which are advertisements under the Buy Box of other listings. This can very easily be very expensive, but is best if you have a list of direct competitors.
Finally, there are Headline Search Ads which are run on keywords but will appear at the top of the search results. This is by far the most expensive type of advertisements, but is best if you are looking to increase brand loyalty.