Adding to 'life skills' - everything to do with home maintenance and minor interior decor renovations. Cleaning stains off the carpet, fixing a faulty washing machine or a clogged pipe, etc. Why? Because in 10 years I never found a single person in the 'home repair' industry that was not a crook and wanted to charge 5x for some stupid shit.
Example from a week ago - washing machine is leaking to the neighbor downstairs, wife calls the customer service, they want to sell her 200€ plan for a technician to come and fix the machine. I get the machine out of the cupboard, notice the hose getting the water in is leaking, order a new one on Amazon for next-day delivery, afterwards machine is perfectly fine.