Laying fibre-optic cables is complex, requiring careful planning, precision, and attention to various technical, regulatory and environmental factors. Fibre technology also presents inherent challenges, as the cables tend to be fragile, and signals lose integrity over long. Optical fiber, the backbone of a fiber network, has the ability to transmit data over long distances at high speeds. However, as the signal travels along the fiber cables, it gradually loses strength, necessitating the use of amplifiers to maintain signal integrity. This article outlines three key errors and how to avoid them. The laying of indoor optical cables is mainly used in the laying of horizontal subsystems and vertical. Where reels are supplied with protective material fitted over the cable, the protection should remain in place until the cable will be installed. During installation, all curvatures should be smooth.