A rule to live by: I won't use anything I can't explain in five minutes.
It is not possible to know what you need to learn.
When in doubt, delete it.
Quality is free. It's not a gift, but it's free. The 'unquality' things are what cost money.
Quality is such an attractive banner that sometimes we think we can get away with just waving it, without doing the hard work necessary to achieve it.
Most things don't work like they are supposed to work.