Crash made me want to start, looking for advise

With all the stock markets and coins crashing, thought that it's finally a good time to get involved (I'm in my 20s, solid job, paying rent, not too flexible with money).

I'm looking for advise on a platform to use, my idea was to buy some coins that are low now, and hibernate them till they get higher or boom later. Kinda how bitcoin did and some lucky souls had some saved aside. From what I read I saw that the best for this kind of approach is Cold wallet, my question is where to is the best place to buy the coins themselves and how do I transfer them there? I'm mainly looking for a platform that is safe and with reasonable fees