Lesson from South Africa: by the time they are at your door it's too late. Perimeter fencing, preferably a 2m high wall with razor wire AND electric fence on top (including on gate). Garden: floodlights, motion sensing alarms, beams, AI cameras. All doors and windows: bars and security gates. Inside: separate living and sleeping area with lockable gate in the hall between. Panic buttons..

None of that is going to stop a legal intrusion, each just buys you time before the paid security company arrive with guns to chase away intruders. Given time, any determined attacker will get in eventually..