After speaking to various older coworkers and family members, I’ve come to the realization that it’s not only the younger generations that need a crash course in personal finance — many of the ones closing in on retirement need a refresher course too.

We hope you guys are taking full advantage of the low in the stock market right now and buying up bargain stocks for your portfolio. But since stock purchasing can be quite the confusing mass of numbers and fees, we’ve decided to throw together a list of fees that you should watch out for — and some — to avoid when possible.