What Sub Reddits To Karma Farm?

As the title says what are the best sub reddits to karma farm?

The best and safest way to do it is to pick a topic of your interest, visit subreddits about that topic and discuss it with other people in a non-controversial way. Look around, see what usually gets upvoted and emulate their posting style.

The more popular methods, such as posting pictures of cats and dumb shit like that are now a bit more risky because they fit a certain pattern that the system is perfectly aware of.