In the U.S., "blue" means "Democratic Party" and "red" means "Republican Party", but in other countries, "blue" means "conservative" (right wing) and "red" means "liberal" (left wing) or "communist".
This blog is mainly to explain a different English language expression every day. Sometimes I post other stuff. I also have a YouTube channel which is mostly about computer software: https://www.youtube.com/englishspacedog