Adjectives add spice and flavor to otherwise dull sentences. In the English language, adjective usage comes naturally when speaking aloud to most people, especially if they have a flair for creative descriptions. When writing, there are some general rules and tips for using adjectives to make your sentences readable.

Modify a noun with a simple adjective to add meaning. Instead of saying, "Look at the cat," try, "Look at the large cat." Immediately, you present a clearer picture of the cat.
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String 2 or more descriptive adjectives together to further modify the noun. "Look at the large calico cat," gives the reader a specific mental image.
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Position adjectives in order when using more than one. There is no hard rule but the generally accepted order is, "size/age/shape/color/nationality/material," for descriptive adjectives. For example, "Look at the huge, old, matted, calico, Persian cat."
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Place general opinion adjectives before specific opinion adjectives. "Look at the pretty, arrogant cat."
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Use a comma when writing similar adjectives. "It was a dark, gloomy night." However, if the adjectives have different meanings, skip the comma. "It was a dark sad night."
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Write adjectives just before the noun in most sentences. However, it is allowable to use the adjective after the noun if a verb precedes it. For instance the sentence, "The cat is large," has the adjective "large" at the end of the sentence, following the verb "is."
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Change some nouns to adjectives by adding a suffix. The noun "hazard" becomes the adjective, "hazardous" when the suffix "-ous" is added. The suffixes that change some nouns to adjectives are, "-ous, -ly, -like, -ic, -ish" and "-al."