how shall I use the API reference? cannot find function documentation

Hi, I am making my way through the ‘Blueprints office’ now to get better understanding of what and how the blueprints can do… There, in the random foliage spawner, they use the ‘Add Instanced Static Mesh Component’ function. which is a bit tricky for me as a beginner because there is also the plain ‘Add static mesh component’ function. What is the difference? I could not find ANY documentation for the function after half an hour Google search. What am I doing wrong? Thanks!