Interactive Brokers for dummies

Oh, so you also hold bitcoin? Can you share your reasons behind investing in bitcoin? Do you hold other cryptocurrencies? Do you invest a large portion your portfolio in crypto? How to buy and store bitcoin that it’s safe? How would you interpret the current $4000 price, do you think it is still undervalued in the long term? And finally, any other significant investments than the stock market and crypto? Sorry for the series of questions, I’ve been battling with the idea of bitcoin for some time and still don’t know what to think about it.