Preventing water leaks / Discussions

I took off the trim around a sliding door during the summer in search of a pesky cricket, I found the cricket but I also found big gaps between window and frame work, it looks like there might be caulking around windows and door on the outside. Now I'm wondering if there is any insulation around any of the  windows and...

...leaks and preventing water leaks. That means air seals around the exterior of windows and sloping window sills to make sure any water that may infiltrate can drain to the outside so you protect your wall assembly. The wall assembly in our window installation video is 8 inches of rigid insulation on the exterior of a 2x...