I want to start recycling more, so I'm interested to learn more about the process(s)/.
Recycling is important. Many new materials and objects result from the process of recycling. 
What are some things that I should start recycling?
Recycling includes items like metal, plastic, textiles, electronics, paper, cardboard, and glass.
Interesting, I didn't know all of those things were able to be recycled! When did humans learn about the process of recycling things?
It goe back to old time when no one wanted to waste anything. Recycling is a key component in waste reduction. The other two is "Reduce" and "Reuse"