serenityLA:
but have a small simple project for my needs and try to realize it learning theory/ prog.language and etc. simultaneously.
What you have described is a challenging project for a beginner.
Break it down into very small learning steps. For example ...
- write a program to collect the temperature data and display in on the Arduino Serial Monitor
- write a completely separate program to generate a web page that just says "hello world"
But before all that you should consider whether you really need 5 Arduinos to detect 5 temperatures. I suspect a single Arduino would be quite sufficient and it would save you from another learning task - how to send data from one Arduino to another.
And if this was my project I think I would build the web part on a cheap laptop or on a Raspberry PI as they have much more resources and easier programming languages for web development. Indeed, if all you want to do is detect temperatures then maybe everything could be done with a Raspberry PI.
...R