2. Friends told me that Vitalik have promised Proof of Stake on Ethereum for years and it never came to past, I believe them and invested in Eth mining equipment, I am now selling to gamers since they are not profitable, not even a bit.
One of the many reasons why doing our own research first before executing is the best, by this way, we don't rely on someone so at the end of the day, we will not blame someone because they say so.
For sure, these will be your lessons, it's normal. A lot of people already experienced this especially me last 2018 bull run and I applied my learnings after that.