The document outlines 5 common mistakes people make with their 401(k)s and IRAs: 1) Paying unnecessary taxes by not naming beneficiaries, 2) Not stretching tax advantages by naming only non-relatives as beneficiaries, 3) Having outdated beneficiaries, 4) Having retirement funds not matching needs, and 5) Leaving funds with former employers. It provides tips to avoid each mistake such as naming beneficiaries, updating them, and rolling funds over to an IRA. The document encourages bringing this information to an advisor to make changes.