The training material will be created by researchers by reviewing national and international guidelines for colonoscopy practices. Using the "Colonoscopy Patient Preparation Guide", individuals will be given face-to-face, information and preparation training on colonoscopy preparation, its importance, the preparation medication to be used and the procedure process for an average of 15-20 minutes in a private room in the unit. After the training, individuals will be given the "Colonoscopy Patient Preparation Guide" brochure developed by the researchers.

Individuals will be subjected to the routine colonoscopy preparation procedure of the hospital by the investigator. Starting three days before the colonoscopy is performed, individuals will be informed via text messages about the foods and beverages that they can consume in their diet and those that are forbidden to consume until the morning of the colonoscopy, the amount of fluids they should consume daily, the use of medication, the use of soda and enema, appointment time reminders.

Individuals in the control group will be subjected to the standard procedure applied in the clinic. No additional education and educational brochures will be given to these patients and text message reminders will not be applied.

The training material will be created by researchers by reviewing national and international guidelines for colonoscopy practices. Using the "Colonoscopy Patient Preparation Guide", individuals will be given face-to-face, information and preparation training on colonoscopy preparation, its importance, the preparation medication to be used and the procedure process for an average of 15-20 minutes in a private room in the unit.

Beck Depression Scale (BDS) was developed by Beck. The scale was created to include clinical symptoms seen in depression. The items of the BDS are organized based on clinical observations and data. The scale consists of 21 symptom categories. Each symptom category is addressed with scored sentences ranging from 0-3. The maximum score that can be obtained from the scale is 63. A high total score on the scale indicates a high level or severity of depression

The scale has a four-point (0-3) scoring system applied separately for each of the three parts of the colon.

3- 0 (İnsuffıcıent) : Unprepared colon in which the mucosa cannot be evaluated due to uncleared solid fecal matter.

1. (Bad) = Part of the mucosa is visible in the colon, but other parts are not visible due to contamination, residual fecal matter and/or opaque fluid.
2. (Good) = Colon mucosa is well visualized but there is a small amount of impurities, small pieces of stool and/or opaque fluid.
3. (Excellent) = The entire mucosa of the colon is well visible. No impurities, small pieces of pus or opaque fluid.