Bitcoin has crashed really hard but we also need to mention what's important:
Bitcoin wasn't responsible for what happened, Bitcoin was safe, working as usual and as usually proven since Bitcoin was started. It was caused by a single, very risky ALTCOIN, where fundamentals of were not proven sufficiently. It was a weak Altcoin causing a huge crash.
An Altcoin, where no link to Bitcoin's tech was around. Bitcoin and Altcoins are totally independent, still people are getting FUD and sell Bitcoin causing a crash.
People should be aware for a similar situation: Bitcoin wasn't responsible for what happened, Bitcoin was safe, working as usual and as usually proven since Bitcoin was started. No need to sell Bitcoin.
People need to learn to be wise and don't sell Bitcoin when different Altcoins are having techical problems. It will likely happen a lot more because we have a lot of shady Altcoins!
A very good recommendation: don't sell Bitcoin when a different Altcoin crashes!
After all, such crashes will only re- distribute coins from weak hands to strong hands (HODLers).
To be succesful means to understand Bitcoin is independent from Altcoins and to understand HODL.