These are some links regarding incense I think you should check out.

There are some great websites here which you can learn a lot from!

https://basenotes.com

https://www.reddit.com/r/Incense/

https://www.nipponkodo.com/culture/history.html

https://viennaimports.com

https://www.britannica.com/topic/incense

https://www.ouddict.com/

https://reedshandmadeincense.com/blog/