How to change the default number format in Excel?

Question

I have this column of string integers in the \'general\' type all the time. Every time I open this spreadsheet, I have to convert it into \'number\' type. But when I do it,

Answer 1

I thought number format was stuck on a date and was reading this post to fix the problem when I realized the following.

Changing the number format in the Home Ribbon to, in my case, General that the next time I opened Excel (Office 365 Subscription version) the General format stayed! Problem solved.

Home Ribbon, Number Format screen capture