Using commas makes sentences easier to read.

Today is Lesser Cold, isn't it?

We must absolutely obey the orders of the emperor.

He was promoted to a high-ranking position.

He fulfilled his responsibilities as a government official.

I will go to the library and borrow a book.

This coast is greatly affected by the ebb and flow.

Shu Han was one of the states that existed during the Three Kingdoms period in China.

The canton of this flag is blue.

Being prepared for an earthquake is exactly what it means to be prepared against adverse events.