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https://www.marxists.org/reference/archive/strong-anna-louise/1959/tibet/index.htm
Here is an account by the first western journalist to visit Tibet after the serfs rose up against the ruling priest class. It's a good place to start educating yourself.
Thank you
Came here to recommend Anna Louise strong. Great and depressing read
The "Tibetan culture" that China destroyed mostly consisted of monks mutilating peasants
There's Friendly Feudalism by Parenti. Read it a while ago and it seemed like a pretty good introduction to the whole topic. Reasonably short too
Penn & Teller: Dalai Lama and Tibet featuring 
Excuse me? Penn and Teller?
Lol, yeah they're not great and it totally digs at china and communism.
Damn, I had some hope
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy:
I remember when it was a huge trend among American libs to vocally support the Free Tibet movement under the assumption that they were saving helpless pacifists from the warmongering CCP. Turns out it was actually a feudal slave state that was being liberated by China.