I just got this Sony a6400 because everyone said it was the best for travel but honestly I am so frustrated right now looking at lenses. I have no idea what any of these numbers mean like what is a 24-70 vs a 16-55 and why are some so expensive?? I spent most of my savings on the camera body and now I realize I cant even take a picture without a lens which sounds so stupid but I really didnt know. Im going to Tokyo in three weeks and I just want one thing I can keep on the camera the whole time. I dont want to carry a bag of glass around or be switching things out every five minutes while im trying to eat ramen.

My budget is pretty tight maybe 400 or 500 dollars tops if I push it. I looked online and there are like a thousand options and people are arguing about sharpness and aperture and I dont even know what those words mean half the time. I just want my photos to look better than my iPhone 13. Is there just like one do everything lens that isnt gonna break my bank account or my back?