Hi everyone, I'm new here

I recently was asked back for two 2nd interviews for IT jobs I had applied for. One is for a Computer Support Specialist (active directory, hardware/software installs), the other is for a Service Desk Fulfillment Analyst(Voip phones, mostly).
I have never had to do a second interview before. The computer support specialist interview will be a 'break/fix' interview. I'm not sure what to expect or how to prepare for either - I definitely want to be prepared and at least not make an idiot of myself lol If anyone could share some of their experiences with break/fix and second interviews in the IT field, I would really really appreciate it