How to buy Bitcoin for cash?

I'm curious about the process of purchasing Bitcoin with cash. Could you walk me through the steps involved in a straightforward and easy-to-understand manner? Are there any specific precautions I should take to ensure the safety of my transaction? Also, are there any fees associated with buying Bitcoin with cash, and how do they compare to other payment methods? Lastly, can you recommend any reputable and reliable platforms or exchanges where I can safely buy Bitcoin with cash?