here are some creative cloud offerings that list as Install and Try. Are the ones Try ones which requires a purchase after a period and those install are free? And, where can I learn the elementary use and understanding of what these other cloud products does that diffrent from each other than the basic Adobe pdf products?
You can trial products freely and no purchase is necessary if you do not like the product and do not want the full version. You can read the main Description of the products to get an understanding of their purpose. The main page for viewing products is on the add-ons website: https://creative.adobe.com/addons