Various friends have on occasion asked me to read over various things for them to make sure they were clear, had all the necessary information, and to also check for grammatical errors. I’m hardly Conan the Grammarian but I get by. (The role of “Conan” falls to one of the Karens — yes, they’re a collective. Much like the Jens.) The most important rule I’ve learned is this:

Always proofread carefully to make sure you didn’t any words out.