@mrlen As far as I'm concerned, your home page only shows toots and boosts from people you follow.
Your local timeline shows activity from people on the same instance as yours and, the federated timeline shows activity from people on every other instance (except those instances that your admin deemed offensive to federate with yours).
Following only the people you want to see their activity (from any instance) should be enough to "clean" your home page.
toot.FreedomWorkshop.com is a city connected to the Mastodon metropolis. Mastodon is a decentralised open source software that unites thousands of microblogs (called instances) into one big "federation". In other words, Mastodon is a "federated" microblogging platform; a metropolis with thousands of little cites (referred to as "instances"). Users can post 500-character status messages which can optionally include images, topic tags, and linked mentions of other users.