Fundamental questions regarding web automation

[zivkingziv]

Hi all. Pretty new to this world.
I wanted to ask the experienced fellas here 2 important questions for me:

1. What is the ratio between your component tests vs. end-to-end tests?
   for me right now it is 100% end-to-end tests and I feel this is just wrong, but - where do I "draw the line" of what to do and when?

2. I have 3 different environments - testing env, pre-production env, and production env.
   for each one of those above, I have different tests and data and this is really difficult to keep track of everything, it is time-consuming to write all of them every time there is a new feature.
   How do you all handle several environments testing in your workplace?

Many thanks :)