In summary, the conversation discusses the definitions of vectors as something with size and direction, and as "displacements in space." The concept of displacement as a vector itself and the representation of positions, forces, and other quantities by vectors with components is also mentioned. ...
Your other questions will become clear, I think, if you look into how to construct a free body diagram (check any statics book) and how to use static equilibrium equations (e.g., the sum of the forces in the x-direction is zero, etc.). Last edited by a mo...