Need help understanding bitcoin, meme coin, dodge coin and just crypto in general. Not a financial guru. Not a smart person

Can someone explain meme coins, bitcoin and cryptocurrency to some who knows nothing about it. Trying to educate myself more about the topic. Thanks (no financial educational background at all)

So after seeing the ‘Hawk Arya’ girl be accused of scamming, I am trying to educate myself on what meme coin is? Is it a form of bitcoin? I am assuming these are forms of cryptocurrency? I never really got involved in this. When Covid hit and people were using there GPU’s to regenerate revenue, that’s about as close as I got to almost understanding what this is (probably not even the same topic)….but yeah if someone wants to link articles or videos or explain to me these terms so I can know what’s going on?

Also, if someone wants to explain the Hailey Welch controversy and how all these people invested in this meme coin and then lost all of it….how does that happen so quickly? Why would people invest with someone who has no financial background?

TIA