How to buy Avalanche AVAX?

I'm interested in purchasing Avalanche AVAX, but I'm not quite sure how to proceed. Could you please explain the steps involved in buying Avalanche AVAX? Is it necessary to have a crypto wallet? And which exchanges support the purchase of AVAX? Additionally, are there any specific fees or charges associated with the purchase process? Also, would you recommend any particular strategies for buying AVAX, given its volatility in the market? It would be helpful to get a detailed and comprehensive guide on how to buy Avalanche AVAX.