What's involved in the endoscopic tif procedure?

No incisions. Similar to a nissen, it wraps the stomach around the distal esophagus but only for approximately 240degrees (not the typical 360) and it is done inside the stomach through use of an endoscopic and not from the outside requiring incisions. Not everyone is a candidate for a tif so speak with a qualified surgeon.
Cinching the esophag. The goal is to tighten the lower esophageal sphincter to reduce the chance of gastric contents from coming up into the lower esophagus. The procedure is certainly of lower risk then the nissen fundoplication but also has a much lower long term success. Make sure your doctor does a large number of these. Keep in mind that tif can make a future surgery more difficult and riskier.