Earning potential through MS Excel

Hello, team Learnvern.
This is Prasun Chatterjee (Emon). Please tell me How much potential is there in terms of earning just by learning MS Excel?? how much time will it take to learn all the aspects of ms excel? After completion of the course can we get a project so that we can get hands-on experience on excel. There is one more query from my side that is data analysis, please tell me using excel for data can we get freelance projects?? Apart from freelancing sites, how could we get clients for freelancing?