How do you setup your website from the beginning and to which details should you pay attention?

Hi everyone,

A few months ago I started with buying a domain and trying to build a correct website myself through WordPress. With the use of many tutorials I tried to create a good working website with a webshop integrated in it. But all the tutorials indicate different details.

I have good knowledge about how you can use a computer and the programs on it, but I have zero knowledge about web development. This is why I decided to ask the question on this platform and I hope anybody can help me out.