the sun sets on something

a little of something goes a long way

Only a small amount of something is usually required to produce a great effect.

catch the sun

To sunbathe.

chalk something up to experience

To take a lesson from a bad outcome instead of grieving it.

Currant bun

[Cockney slang]sun or The Sun newspaper

day in the sun

A time of glory or ascendancy.

fix the roof while the sun is shining

To deal with a problem or potential problem while conditions are favorable.

fly too close to the sun

To become overly ambitious or greedy; to overreach oneself; to reach for something unattainable or unachievable.

get something over with

To proceed to do something as soon as possible, especially so as to have something unpleasant behind oneself.