If you smell or hear a possible gas leak, leave immediately without switching lights or using a phone inside, then call emergency services or the gas utility from well away from the building.
Home Safety guides
Treat a fallen or damaged power line as energized, keep people away from it and anything touching it, and call emergency services from a safe location.
After a small clean-water plumbing leak, record what got wet, dry promptly when safe, and distinguish a small mold cleanup from damage that needs professional help.
Tell surge protection apart from backup power, compare plug-in and panel-level protection, and know what to check after a warning light or electrical event.
Use official clearance, structural and utility stop signs, protective equipment, documentation, and clear professional handoffs before entering a flooded home.