Homeowner of many years & worked for a builder—have recaulked most of my house. It is pretty easy & I think it’s fun. Definitely watch a few tutorials. Makes such a huge difference when you refresh the area. As poster above said there is a LOT of movement in a house the first year or so, perfectly normal. What you need to be wary about is cracks that seem out of place. Just call the builder/contractor & ask or send a pic if you are unsure.