Main skills to run a business

​Hello everyone I'm 16 in Australia.Working 5-6 hrs a week at a restaurant and get about $100 a week even through this pandemic here. Started school a year early and I am about to start my final year of high school which is my HSC. Subjects in Chemistry, Physics, Ext 1 Math and Engineering, doing fairly good. My father has a niche business as an instrumental engineer mainly focused in density gauges designing, manufacturing and regular inspections or rarely other radiation instruments in the mining industry which pays very well for a niche market. I think pre Covid he was earning 150k AUD a year even with him not being able to work for 2 years prior to being out of work on and off due to the cancer which lost him clients. Only one worker who is my uncle who welds for him only for a day because he can't (pace maker).My father has shown clear interest in retiring in about three to four years, giving me and my 15 yo brother his business. My father has poor health as he had a life threatening stomach cancer, pace maker, arthritis, emphysema, HAD serious depression and the bone structure of a 90 year old for being 55 due to later discovering that a steroid was harmful in attempt to reduce pain from his arthritis. He has been through a lot and has been teaching me the science and required information for the work behind the business, he already has got me to do a course as a "Certified Radiation Assessor" already.I'm honestly a little bit anxious but very humble and grateful to be put in such a good position with a business being handed down to me. It's just crazy how quick I've grown up and just get sent straight into a business.So down to the big question what are the main skills I should be working onto to run a business?I know that one important thing is marketing and it's something my father has no marketing skills as there isn't even a website which is crazy to me but I talked to him about and he's going to get a website up.I'm unsure whether foreseeing the future of the business is considered a skill but I believe in the future the biggest sector mining in Australia will take a big hit with the goal of reducing emissions. I've already looked into studying a field that could already compliment my father's business but give further options if mining went south. Possible field I think could be good is an electronic engineering.So successful business owners of reddit what would you say is the most important skills that helped you run your business?Also would it be worth my time learning how to code. I only the know the basics of python. see hubwealthy.com/wealthy