Here are some good resources on the internet that you can search for more information:
Inguinal and femoral hernias – https://www.facs.org/for-patients/the-day-of-your-surgery/adult-inguinal-and-femoral-groin-hernia-repair/
Umbilical hernias – https://www.facs.org/for-patients/the-day-of-your-surgery/adult-umbilical-hernia/
Ventral/Incisional hernias – https://www.facs.org/media/zq4hddzo/ventral_hernia.pdf
Preparing for your surgery: Surgical Pre-Optimization Care Pathway (SPOC)