In Business, Management and Administration, you keep a business running. You may be in charge of the business as the boss. Another option is to keep track of expenses and income. Or, you might hire and train the workers.
In Finance, you keep track of money and keep records. Or, you could help people get loans and save money. Another option is to help people buy insurance. You could also run a bank.
In Hospitality and Tourism, you help people have fun. You could help people who want to eat out get their food and drinks. Another option is to take care of guests at a hotel. You could also help people plan trips and vacations.
In Marketing, Sales and Service, you sell products. You might create ads to get people to buy products. You might sell things directly to customers or use the internet to sell things.