When are the optimal years to learn [Excel, Technicals, etc]

I'm a first year (B.S Economics) and am highly motivated + interested to enter the realm that is investment banking. I have (near) zero knowledge of any hard skills that is required within that field including financial modeling, cash flow statements, other technical stuff... you get the point (excuse my bad diction, I'm just too f'ing tired to put effort into this right now...). Should i spent this first year learning excel? technical stuff? What about my second year? I assume I need to get some stuff down before my summer (of my second year) and even more in the summer of my junior year, as those are the times when I will be looking for internships (SA). I'm not sure if my question is 100% transparent, but I hope you guys can give some kind of objective/practical answer. Please nothing along the lines of "touch grass", or "enjoy life". I am willing to and can comfortably spend money for courses that may be useful (is WSO a credible source of education?), and/or buy equipment that may be better suited for the job. I am currently using an M2 Chip Macbook Air, but heard that windows laptops are more preferred for general reasons. (Should I buy a Lenovo X1 carbon?)