Some bots you must build to use like the foss bot for example but others have already been built and you can utilize them. Here is my most recent list of UPVOTE bots...These bots come by and give your post an upvote boost. Just transfer some SBD and the link of your post in the memo line and you are good to go. https://steemit.com/blog/@binkley/my-favorite-upvote-bots-revisited

Most of the bots I have worked with get deployed from a server. Hackers are gonna hack for sure so never give away your master key or main login key.