How to get Roblox credit for free?

I'm looking for ways to earn Roblox credit without having to pay. I've heard there are methods to get free Robux, which is the virtual currency used in Roblox, and I'm interested in learning more about these methods. Specifically, I want to know if there are any legitimate and SAFE ways to obtain free Robux so I can use them to purchase items and enhance my gameplay experience in Roblox.