I bought my first satoshi several years ago. My acquaintance with Bitcoin has grown into a business of arbitrage trading.
Personally for myself, I consider it the most reliable way to store Bitcoins in the “brain wallet”. For some small amounts, you can use the wallet inside the cryptocurrency exchange. I highly recommend to buy bitcoin on the exchanges. This is the most economical way, in my opinion.
The total cost of buying Bitcoin will be no more than 0.35% of the deposit. With a serious turnaround, saving 5% can be a significant amount, especially if you are engaged in arbitration.