Motherboards are breakable, but not easy to break. They are designed to be durable and to withstand very high temperatures, but sometimes motherboards can sustain physical damage, electrical shocks, and even experience heat issues. In any case, always make sure that you handle your PC hardware with care and be careful not to apply too much pressure. Motherboards that have CPU socket pins for LGA(Land Grid Array) CPUs have pins that are extremely prone to damage when proper installation steps aren't followed. Always consult owner's manuals before building, and watching videos from hardware experts on proper motherboard handling and building techniques can help too.