This doesn’t always work, especially if you:

• View by All/Trending/the equivalent depending on your client/instance
• Follow broad communities (e.g. Shitposting where literally any topic is allowed, but you’d rather just not see more politics)
• Follow communities that have rules against certain content that is sometimes just ignored, especially by new posters (e.g. there might be a “News” community that has a rule called “No U.S. Politics” but people in the U.S. will still post something related to American politics there because they simply didn’t read the rules first)