Home security, how to implement it best?

I have RC2N + grille on the basement windows. The basement windows are each 1m² in size, located in dark corners, not visible to the neighbors, and from the outside at ground level, super easily accessible.

In fact, a normal pane (with RC2N) already makes quite a noise when it is broken, so I can easily believe it when people say that in nine out of ten cases the glass remains intact, and since that is the only significant reinforcement of the higher classes, one can really consider how sensible that is for an average private house.

That is exactly what our window installer (who actually wants to make some profit) told us as well, which is why we will only get the burglar resistance.

Thank you all. In summary, I would now do the following: 1. from RC2N -> RC2 2. Properly plan the lighting on the house so that no dark sections occur 3. Even though this topic was somewhat controversial, I would still plan for camera surveillance. The only point is how I can make it unpleasant for a potential burglar? Dog is out due to an allergy.

The only point is how I can make it unpleasant for a potential burglar?

Instead of a dog, it would probably be the siren.

The only point is how I can make it unpleasant for a potential burglar?

Burglars are just as different as neighbors and other people. Therefore, it would be negligent to assume that there is THE burglar who can be deterred LIKE THIS.
As discussed many times, it should be made more difficult, but it is especially the very individual situation, the feeling AND necessity that need to be clarified. Unfortunately, even at the police advisory office, advice is often given with a one-size-fits-all approach.
You can pray about the topic over and over, the best thing is to do what appeals to you. In general, however, I notice increasing fear without simultaneously increasing numbers of cases.
I would rather not be guided by such fear.

Dog is ruled out due to an allergy.

Elephant, Bengal tiger or black mamba.......

Burglars are just as different as neighbors and other people. Therefore, it would be negligent to assume that there is THE burglar who can be DETERRED IN THIS WAY.
As discussed many times, it can be made more difficult, but it is especially the completely individual situation, the feeling AND necessity that must be clarified. Unfortunately, even at the police advisory center, advice is often given in a one-size-fits-all manner.
You can go over the topic again and again, but the best thing is to do what appeals to you. In general, however, I recognize increasing fear without a simultaneous increase in case numbers.
I would rather not be guided by such fear.

Elephant, king tiger or black mamba.......

It is not about fear but about reasonable planning in advance. I have experienced with friends how they felt after a burglary. You can try to take this topic lightly but I will try to do the most so that no one rummages through my private belongings :)