The best platforms for buying crypto-currencies are proven platforms, you should not respond to tempting applications of SCAMs
In my opinion the most reliable are such exchangers:
localbitcoins.com
cex.io
changelly.com
At the same time, if you do not trust bitcoin, you should think about...
While bitcoin - $8000, I bought at - 2 bitcoins, I consider this a good investment. Many do not believe that bitcoin will grow again, but I believe. During the fall, it's time to buy the Crypto currency, if it falls still, at least to 6000, I'll buy more.
When I was a student and bitcoin just showed up, I ran the bitcoin on my laptop and sold everything at 1 dollar. Now I'm sorry and I consider myself a fool. (