Please explain it to me like I’m a toddler

I’m very new to this, what are the risks/disadvantages of buying bitcoin on a platform such as Robinhood? What is the standard or generally safest way of buying?

I just need to know if I buy bitcoin on Robinhood that I plan to hang on to if it’ll cause any problems down the line. TIA

Edit: thank you for all the thoughtful (and funny) comments! It’s clear I still have a lot of research to do, Im grateful for the suggestions they’re all helpful