Be more or less specific. No sentence fragments. Contractions aren't necessary and shouldn't be used. Foreign words and phrases are not apropos. One should never generalize.
Comparisons are as bad as cliches.
Don't use no double negatives. Analogies in writing are like feathers on a snake. The passive voice is to be avoided. Eliminate commas, that are, not necessary. Parenthetical words however should be enclosed in commas.