The structure and function of the modern colonoscope / John G. Lieb II -- Enhanced imaging techniques : what they can and cannot do and when to use them / Norio Fukami -- Air versus carbon dioxide insufflation versus water immersion during colonoscopy / Douglas Pleskow and Tolga Erim -- External pressure during colonoscopy : how and when to use it / Nicholas Villa and Waqar Qureshi -- Endoscopic loops during colonoscopy : how to avoid their formation and how to reduce them when they arise / Vivek Kaul and Shivangi Kothari -- Endoscopic polypectomy techniques : from small to large lesions / Ali Siddiqui, Serag Dredar, Anna Strongin, C. Andrew Kistler, and Shou-Jiang Tang -- Postcolonoscopy decision making : the guidelines and beyond / Melissa A. Verrengia and Jeffrey L. Tokar -- Colonoscopy perforations : how to avoid them and what to do if they happen / Louis M. Wong Kee Song and Todd H. Baron -- Colon decompression / Robert E. Sedlack -- Colonic stenting : what you need to know / Kathryn R. Byrne and Douglas G. Adler -- Lower gastrointestinal bleeding : how to evaluate and manage / Linda S. Lee and John R. Saltzman -- Colonoscopy quality indicators in training and beyond : what you need to know / Jonathan Cohen -- Financial disclosures