Answer :
Answer: The main idea of the paragraph is that you should have good handwriting, and improve it if needed.
Explanation:
We can gather the main idea by looking at the details given:
-> Improving your handwriting may provide you with some opportunities ...
-> Good penmanship allows you to demonstrate ...
-> ... considerate of your readers ...
These all make having good handwriting seem like a positive thing. We can reword this into more of a complete main idea:
The main idea of the paragraph is that you should have good handwriting, and improve it if needed.