Which sentence states a fact?
A plain omelet takes one or two minutes to cook on top of a stove. An omelet is worth the effort needed to make it.
A fact is something that can be proved to be true.
The month of July has more days than the month of June.
This is a fact. It can be proved by looking at a calendar and counting the number of days in each month.
An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true.
July is a better month than June for camping.
This is an opinion. People may have different opinions about which month is "better" for camping.
The first sentence states a fact.
A plain omelet takes one or two minutes to cook on top of a stove.
It can be proved by looking up instructions for making an omelet.
The second sentence states an opinion.
An omelet is worth the effort needed to make it.
Worth the effort shows what a person believes, thinks, or feels. Another person might have a different opinion about whether an omelet is worth the effort.