As a the old saying does if you don't know where you are going then any road will do!
Since you are on this site, you are looking at ways to improve your software development process.
It is also assumed that you have a Business Vision of what the destination looks like nor a Plan of how to get there.
Sadly there are plenty of business owners that just dive in, there is noting as Agile as just typing right!
These road maps are suggested routes in implementing systems that will help you deliver solutions cheaply and with less risk.