How do you buy pets on Roblox?

Could you elaborate on the process of purchasing pets in the virtual world of Roblox? I'm particularly interested in understanding the steps involved, from navigating the platform to actually making the purchase. Is there a specific section dedicated to pet adoption? Do users need to possess any particular in-game currency or items to acquire a pet? Are there any restrictions or limitations to consider, such as the number of pets one can own or the types of pets available? Additionally, is the process secure, and what measures should users take to ensure a smooth and safe transaction? I'd appreciate a detailed explanation of the entire process.