From publisher blurb:
Level up your GMing with 151 pages of unique GM tips and advice.
Roleplaying Tips is a weekly newsletter hitting inboxes since 1999 focused on actionable tips and techniques for tabletop game masters.
In this omnibus are the complied issues RPT#634-638, plus a bonus article about a cool underground magic item market: The Bale Ghoul Bazaar.
Some of what's in this issue: