Education in Indonesia has been affected by the Covid-19, which was followed up by closing schools and replacing them with studying/ teaching online from home (WFH). Since its implementation in several provinces, many teachers have started to get confused about teaching their students because there is no online learning guide. A preliminary study conducted at the Drupadi Cluster shows that many teachers experience difficulties in implementing online learning. This research aims to develop an online learning guide book through Google Classroom assisted by Zoom that is valid, effective, and practical for elementary teachers. It is an R&D that refers to the 4-D model from Thiagarajan. The trial subjects were 40 teachers. Data collection techniques used tests, observations, questionnaires, interviews, and documentation. The data were analyzed by qualitative and quantitative descriptive analysis. The guidebook has met the valid criteria, with the average score obtained from three validators is 3.56. The guidebook is also effective for increasing teachers' knowledge of online learning as evidenced by the N-gain results amounted to 0.60, included in the moderate category. It is also effective in improving their online teaching skills, as proven by the average score of 20.3 (very high). It has also met the practical criteria indicated by all teachers' average response scores of 55.38 (very positive). The developed guidebook has met the criteria of being valid, effective, and practical to help elementary teachers deal with online learning during WFH.