Not sure how much mileage this thread will get, or if we had something like it in the past, but I thought I'd dump in helpful bits of info I've found out that are practical in terms of how items work or what can fix something.
Opening All of Your Car Windows Using Your Key Fob
Many cars apparently have a command on your key fob that if you press it correctly, you can lower all four of your car windows at once. I had my Honda Accord for 4-5 years before figuring this out. For the Honda Accord (and potentially for many others), you click the Unlock button once, then press and hold the Unlock button. After a second or two, all four windows will start to lower... as long as you hold down the button.
This is helpful in the summer, when the inside of your car is like a blast furnace and you want to release some of the heat before you actually reach your car. You can roll down the windows from 50 feet away and it'll be at least a little more cooled down than it would have been otherwise.