Hi, as mentioned I am total newbie here. To give you more context about me, before you start throwing tomatoes on me, I have some knowledge about networks and router os. I had network course in university, but it was10 years ago and I forgot some things, so please bare with me.

The resources that I have found are "detached" one from another and it is hard to figure out what comes first when it comes to configuring a router.
I wanted to setup guest network with password, but it was kinda tricky, didn't manage to do it in easy way. I am the problem, but resources are limited, at least for beginners. The other day I had in mind to develop an app where ppl will get a recipe with the code that can be used to access the internet, didn't manage to find resources in order to make PoC.

Since I am a bit confused, can you help me where to start, do you have some guideline how and what to learn?
I know these are generic questions, but I tried to break the problem from different angles and I found out that I always miss some knowledge in order to achieve the goal.

Can you help me to learn how to use and configure RouterOs?

Thanks

Here is my suggestion for you:
First Time Configuration
and a very nice security guide from Manito Networks Tyler Hart who is a networking and security professional
MikroTik Security Guide

Thanks a lot.