Advice on this varies, you need to do the research and make a decision.   I reuse jars and lids all the time.  Some people advise new lids every time, others will never reuse a jar.  The best thing here is good old fashioned common sense.   Generations of jam makers have safely reused jars and lids year after year after year.  Check the lids and discard any that are dented, damaged or rusted.