Hey Agenllace, thanks for this feedback!
To prevent fires, you can build shelters and upgrade them with Lightning Protection. Lightning will then strike these shelters instead of those around them, and won't cause fires.
I will add a new notification tutorial about fires and how to prevent them in a future update as I do agree this part is a bit vague!
Please let me know if there are other questions or issues you have, or even ideas if you think it can be done better! :)