I’m not an expert on home security, and I’m not familiar with all the details of your situation, so I don’t want to give any advice beyond my knowledge and competence. I’m merely pointing out things where I’m confident that the information I’m giving is accurate. It does seem obvious to me that if your outside doors and windows are reasonably well-secured, it will provide a stronger barrier than anything you can expect from interior doors without very extraordinary effort and investment. So I would definitely focus on the former, as far as security based on physical barriers goes. My impression is that reasonable measures like window grates should be sufficient deterrent for the overwhelming majority of potential intruders.
As for the other things mentioned by various commenters, like weapons, guard dogs, etc., even if I were an expert, there is too much that depends on your specific situation, from the relevant laws in your jurisdiction (for example, even mace is illegal to possess where I live) to your own physique and disposition.
I’m not an expert on home security, and I’m not familiar with all the details of your situation, so I don’t want to give any advice beyond my knowledge and competence. I’m merely pointing out things where I’m confident that the information I’m giving is accurate. It does seem obvious to me that if your outside doors and windows are reasonably well-secured, it will provide a stronger barrier than anything you can expect from interior doors without very extraordinary effort and investment. So I would definitely focus on the former, as far as security based on physical barriers goes. My impression is that reasonable measures like window grates should be sufficient deterrent for the overwhelming majority of potential intruders.
As for the other things mentioned by various commenters, like weapons, guard dogs, etc., even if I were an expert, there is too much that depends on your specific situation, from the relevant laws in your jurisdiction (for example, even mace is illegal to possess where I live) to your own physique and disposition.