Look up words it doesn't recognize. Look up words you aren't sure of, too - you may be spelling the wrong word right. Punctuation is a horse of a somewhat different color in resume writing. You will still want to use periods at the end of incomplete sentences, but not at the end of short items in a list. Longer phrases requiring commas within elements need semicolons for clarity.
Lists follow colons.
Use dashes or parentheses sparingly, if at all. A resume is you on paper. Not what you have been so much as what you can be. Be scrupulously detailing what you have already accomplished. A resume is a marketing tool - not a career obituary.