Summarize this article:

Scottish Gaelic nouns are all either masculine or feminine. This is similar to the structure of the romance languages like French, Spanish and Italian, but may seem very strange for English speakers. Gaelic grammar makes no distinction between the gender of plural nouns. Aside from the fact the a children's book is going to be focused toward readers with a limited vocabulary, they will also have simple sentence structures that will make it easier to learn basic grammar rules. Don't try to focus on memorizing too many grammatical rules. Instead, stay focused on speaking and hearing the language. Native speakers learn the vast majority of grammatical rules for a language without ever being taught. Some language teachers and linguists believe focusing on grammar too much can be a detriment to the learning process.

Summary:
Learn to identify masculine, feminine and plural nouns. Read Gaelic children's books. Learn grammar conversationally.