In League of Legends, you'll make decisions with incomplete information. This is because you cannot see everything happening on the map due to the "fog of war". The fog of war is the darkened area on the minimap. It conceals enemy movements, making it riskier to move around without teammates. However, you can improve the visibility by placing wards around the map. Wards provide vision in a small circle from where it was placed. Also, it can prevent deaths as you'll know the location of enemies and make plays based on this information.