How do you properly quote a sentence period after or before quotation marks

Commas and periods always go inside the quotation marks in American English; dashes, colons, and semicolons almost always go outside the quotation marks; question marks and exclamation marks sometimes go inside, sometimes stay outside.

Explanation:

the unsaturated fatty acid is a fat consist of one or more double bond in the fatty acid chain. if it contains one double bond then called as monounsaturated fatty acid however if, it contains more than one bonds called as a polyunsaturated fatty acid. true fatty acids are called unsaturated fatty acids as it reduces the risk of high blood cholesterol and good for health.