The problem addressed in this qualitative descriptive design was many K-12 teachers did not have adequate training necessary for effective instruction in online learning. The purpose of this study was to examine the types of training in online instruction for K-12 teachers provided by school districts. The Technological Pedagogical Content Knowledge (TPACK) framework developed by Mishra and Koehler (2006) was applied in this study as it organizes dimensions of teacher knowledge development for digital learning. A qualitative descriptive design was utilized in this study to examine training for K-12 teachers in online learning, including methods of data collection of interviews and pedagogical artifacts gathered which provided evidence of training received by research participants from their school districts. Twelve research participants were chosen from public and charter schools in the Phoenix, Arizona metropolitan area who were licensed teachers that had experience in both online learning and traditional face-to-face instruction. For data analysis, inductive coding and thematic data analysis through NVivo software were employed to code the data and analyze the findings. Some key findings included stress associated with the change to online learning, little training provided in online learning by K-12 school districts, and low student engagement encountered as a challenge in online learning. Approximately 83% of the research participants in this study indicated they received very little training in online learning from their K-12 school district. Consequently, recommendations for school leaders include providing training for K-12 teachers in student engagement strategies for online learning, and providing training in Edtech tools and online learning platforms to enhance teacher effectiveness in online instruction. Future researchers may expand upon this study by examining the online learning challenges of teachers and training provided by school districts outside of the Phoenix metropolitan area. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]