How does our sun’s 11 year sunspot cycle effect Earth?

Answer 1

The Short Answer: (about the cycle itself is...)
The Sun's magnetic field goes through a cycle, called the solar cycle. Every 11 years or so, the Sun's magnetic field completely flips. This means that the Sun's north and south poles switch places. Then it takes about another 11 years for the Sun's north and south poles to flip back again.
(from NASA)

Answer 2

And... giant eruptions on the sun increase on the solar cycle, they send coronal mass ejections into space and this can cause lights in the sky called Aurora. It can also impact radio communications, and electricity grids on earth.
(from NASA)