Like most photographers , I started taking photos with nothing but a cheap DSLR and a kit zoom lens. Fast forward a decade and my collection of cameras and lenses has far outgrown my camera bag. It takes years (and a ton of financial disapline) to have everything you need to shoot a wedding.
If you’re just starting to gather cameras and lenses, my biggest advice is to buy a decent camera body and ONE really nice piece of glass. I’ve upgraded my camera body several times but I have kept the same lenses for years!