For things like literature, film, philosophy there's a history of canon.
The important works that you need to see to understand the subject.
I've never watched wrestling before but I would really like to.
How should I go about getting into the genera?
Get the free trial of the WWE Network and watch any of the Monday Night Wars network specials. Just take most of the commentary about the Kliq and Triple H with a grain of salt since they greatly overestimate their impact on the industry and keep trying to put themselves over 20 years later.
Download Lucha Underground and start watching. It's all english commentary so don't worry about the mexican name. Look for the 720P torrent on kickass. It's huge but good.