What I want to ask is: can I use the results of others when doing scientific research, whether it is math, physics or other science, without trying to prove them myself or try to verify them? For example results like theorems, proofs, definitions, abstract mathematical objects in math or results in physics. Should I refer to them in the end of the research and tell the literature I used, for example which books or notes? What results whether older or more modern could I use? They should be verified I suppose?
Could I try to answer my own problems or questions or already known problems? Should I communicate with scientists from the university I study at? Could they help me to tackle the problems i want and read the things I want to read?If the math or physics I want to use for the problems are not already discovered should I try to discover them myself?