Docs improvements with common/best practices

### What is your suggestion?

After having some issues with copying dependencies DLLs to the build folder, I reached out in Slack and I got the help I needed (thanks a lot community! 💙)

The community rightfully pointed me to the documentation about how to migrate from Conan v1 to Conan v2, where there was an example of exactly what I was searching for.

The main issue though, is that someone has to at least know how something worked on Conan v1 in order to know that that thing is not working anymore and there is a new way of achieving the result.

As a Conan newbie, what I would love to see in the docs would be an area where some best/common practices are explained and easy to find 🙂

### Have you read the CONTRIBUTING guide?

- [ ] I've read the CONTRIBUTING guide