That was a more extreme example. I expect most Chinese online know of censorship. But do you/they know about the government caused famine under Mao?

As far as I recall, everything else that is negative, except 1989, was taught in secondary school history class.

This is not correct. I grew up in China (Beijing to be more specific) and it is definitely not taught in school. All history I’ve learn casts China as having done everything right.

Were you taught using 人教版 or 北师大版 history textbook? I'm pretty sure 四人帮 and 大跃进 were inside 北师大版 and called a mistake. Well at least for my year. Maybe they changed it, or you didn't pay attention in class.

It was quite a while ago so I don’t recall who made the book, I went to high school there more than 10 years ago. I used whichever books were standard. But if I remember correctly, they portraited Si Ren Bang as a group of four planning against the state, no fault was assigned to China or Mao.

What about 大越进 or 文化大革命? At least in my textbook they were attributed as CCP and Mao's mistake.

This is a censored answer /explanation of the term.