Author and collector Bob Richter, known for his role in the PBS series “Market Warriors,” is an expert on living with vintage items. He began visiting flea markets and thrift shops as a child and started his own vintage ornament collection. He later went into the family design business and worked at an antique shop, all the while learning more about how to find and identify choice pieces. He just published “A Very Vintage Holiday: Collecting, Decorating, and Celebrating All Year Long,” which explains what to look for in old decorations and how to meaningfully celebrate Christmas, Hanukkah, President’s Day and other festive occasions. Ask Richter about the best time to shop for vintage Christmas decorations, how to care for fragile mid-century glass ornaments and how to determine whether old strings of lights are safe to use.