You can find training videos on sites like Lynda.com (flat monthly fee) or udemy per course payments, including some free ones.
They have about 300 Excel related courses here:
https://www.udemy.com/courses/search/?q=...
I'm not a finance professional. I use excel a lot.
I google when I need to do something that I don't know how.
By taking a course, or doing the tutorials or reading the manual.
Take Google help..learn everyday something new..
Take a class, read a book, read the manual.
excel courses are the best i think.
teach themselves, an excel course...
there are lots of great videos on youtube
https://answers.yahoo.com/question/index...
https://answers.yahoo.com/question/index...
