Which sentence states a fact?
A potato is a kind of stem, not a root. Baked potatoes with butter are delicious.
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 potato is a kind of stem, not a root.
It can be proved by looking up information about potatoes.
The second sentence states an opinion.
Baked potatoes with butter are delicious.
Delicious shows what a person believes, thinks, or feels. Another person might have a different opinion about how baked potatoes taste.