So I finally did it and bought a Sony a7c! I am literally so excited to start taking photos but honestly I am completely lost when it comes to the glass part of things. Like I have the little kit lens that came in the box but everyone online says it isnt very good and I really want my photos to look professional for my trip to Tokyo this October. My logic was that I should just get one lens that can do everything so I dont have to keep swapping them out while Im walking around because I just know I would drop something or get dust in the camera and that would be a nightmare.

I spent like three hours last night looking at different zoom lenses and my head is kind of spinning with all the numbers. I saw one that was 24-70 and another that was 28-200 and I was thinking that the 200 one must be better because it goes further right? But then someone on a blog said something about f-stops and how 2.8 is the magic number but those ones dont zoom as far as the others. Its all very confusing for a beginner like me so sorry if this is a really basic question but I really have no idea what I actually need. I just want something that is good for taking pictures of ramen and also big buildings and maybe some people on the street or a far away mountain.

My budget is around 900 dollars maybe a bit more if it is really worth it but I saw the Sony brand ones are like two thousand dollars which is just way too much for me right now. I saw a Tamron 28-75 that people seemed to like and also a Sigma one but I dont know if they work as well as the Sony ones or if they will break? I really just want an all around lens that I can leave on the camera forever and never have to think about it again. Is there like a gold standard for this? Should I go for the one that zooms the most or the one with the 2.8 number? I'm just so worried I'll buy the wrong thing...