Obesity is one of the most challenging pandemics in the world due to various complications that include T2DM, high blood pressure, respiratory diseases, dyslipidemia and others. RYGB and SG are two common bariatric procedures for obesity and comorbidities. RYGB is a restrictive and malabsorptive procedure. SG is a restrictive bariatric surgery, and due to its low risk, it is being used more and more. SG and RYGB were observed to have beneficial effects on the loss of excess weight, T2DM, dyslipidemia, hypertension, and OSA. Certain complications occur with both, while with SG one of the most common are hemorrhages, leakage of the gastric resection line, abscess, stricture and GERD, with RYGB these are anastomosis leakage, intestinal obstruction, deep vein thrombosis, pulmonary embolism, internal hernia and lack of nutrients. According to studies, similar short-term and medium-term results of SG were observed as with RYGB, but in long-term results, RYGB proved to be a more successful method of choice. As a member of the multidisciplinary team in bariatric surgery, the nurse/technician must use and improve bariatric surgery knowledge on a daily basis according to the latest guidelines for the prevention and treatment of obesity, so that the best possible care can be provided to patients.