How to buy BTC direct?

Excuse me, could you please elaborate on the process of buying Bitcoin (BTC) directly? I'm interested in understanding the steps involved, from selecting a reputable exchange or platform to actually completing the purchase. Are there any security measures I should take into account? Additionally, how does the verification process typically work, and are there any fees associated with the transaction? I'm looking to buy BTC as a long-term investment, so any advice on storage and managing my digital assets would be greatly appreciated. Thank you for your time.