Almost every Christmas light sold today is LED, and for good reason: LEDs use far less power, stay cool to the touch and last longer than old incandescent bulbs. What still varies is color, bulb shape, how many strands you can connect, and whether the lights are rated for outdoor use.
For the tree and indoor decor, start with indoor string lights or battery fairy lights for places without an outlet. For the house, compare outdoor Christmas lights and icicle and net lights for rooflines and bushes.
Want a big effect with little effort? Light projectors cover the front of a house in minutes. For lights you can program by color and pattern from your phone, see smart Christmas lights. Replace any strand with cracked wires or damaged plugs instead of repairing it.
Before you buy, check that outdoor products are rated for wet locations, and plug them into a GFCI-protected outlet.