Just gotta read everyone else's posts and find something you want to join the conversation on. Easiest way to get posts and more likely to get reactions because it isn't just random spam so you get coins.
Anything that feels like spam or farming you'll notice gets very few reactions compared to other posts that have more. Even with quotes, still gotta put something more than just a couple words otherwise it comes off as farming (not saying you do this, just for anyone trying to get coins)
Coin farming is obvious because they just make as simple of possible of posts to get the credits. Reactions will earn you much more in a shorter time period and too much spam will get mods involved, making your efforts worthless when they delete it and your coins get taken