Grammar Questions (Massy)

I have some questions about nouns.

I have studied German a little, and I know there is grammatical gender in German language. In some languages, we must be careful about the gender of nouns, otherwise the sentence can't be correct.
And I learned that we don't have to think about the gender of the noun in English, because English language have no idea of grammatical gender.

But sometimes I see the idea of grammatical gender in English. For example, ships are often regarded as female, so we often use "she" instead of "it" to indicate ships. Name of the country is the same, they are sometimes regarded as female.

So my questions are below.
1. Do we have to use "she" or "he" instead "it" to indicate these words?
2. Is there another example of grammatical gender in English?

Answers by Addison:
The reason why we sometimes use he or she instead of using it to indicate something as human is that we put human's emotion into the referring object literary to make the reading more colorful so that it's not that essential.Many of the 'gender' of the image were originated from ancient Greek mythology; for example it's easy for us to identify the 'gender' of the sun, the moon, the earth, ocean, lake, mountain, forest, wind, lighting, thunder, wisdom, success, spring, even Cannery Row! Briefly, we identify their 'gender' simply from our common sense based on their characteristics and common use. By the way, the 'gender' of a same thing may alter in different situations such as wind and ocean.