There are many options to farm Bounty Materials in Diablo 3 Season 30. These materials are very useful to extract items for Kanai's Cube and to create the strongest items in the game. For a full Bounty Guide you can check out this link. Below you can find an overview for some of the best builds for each different class.
However, since Season 29 and the addition of Visions of Enmity into the core game as a permanent feature, it makes more sense to farm these in order to get Bounty Materials rather than Bounties themselves. Keep in mind Bounties Farming only really make sense to complete Season Journey and get Ring of Royal Grandeur.
Overview
A Tier
UP TO 15%
SLOWER THAN S TIER