You’re like the 5th person to ask, AND ILL GLADLY EXPLAIN!
Based" on the Internet usally means agreement, and social media and forum users use it to express approval or admiration, and it’s also used for hot takes that are unpopular and when you agree with it you say “Based!” It’s usually used on Discord I believe, oh and “online political slang”

For here is a definition on urban dictionary
“A word used when you agree with something; or when you want to recognize someone for being themselves, i.e. courageous and unique or not caring what others think. Especially common in online political slang.”
“The opposite of cringe, some times the opposite of biased.”
