Please use the search function. Many questions have already been brought up in the past years and it's unecessary to create a new topic for each.
https://www.pantheonmmo.com/content/search?query=crafting&type=forum_topic&submit=
https://www.pantheonmmo.com/content/search?query=harvesting&type=forum_topic&submit=
Thank you.
Read/watch these in this order and that'll get you up to speed on crafting and harvesting:
http://pantheonmmo.com/newsletter/crafting_and_harvesting/
https://www.pantheonmmo.com/newsletter/2018_january_harvesting/
https://www.youtube.com/watch?v=y3qG-RdZBD8
https://www.pantheonmmo.com/newsletter/2018_october_harvesting_update/