Any good (and free) online architecture/art courses for a high school graduate?

I came across HarvardX courses which give out certificates, but most people are saying its trash.

I don't need the certificate to "land" a job, it's only because I'm genuinely interested in Architecture, and I also want to express it with a tangible proof like a certificate for internships or generally for my application besides my portfolio or anything else. I can't afford full on programs, so online ones seemed to be a good option.

I also saw MIT's courses but they don't give out any certificates. Most people also agree that Udemy or Coursera is trash :/ (and some are too expensive)

Any ideas and/or similar opportunities would be appreciated!!!