I presume you are asking what is the best way to begin learning software development.
Firstly, decide what language you wish to learn.
For example, if you wish to learn C#, then download from here
] and follow the instructions.
This is a cutdown version but as a starter it is excellent.
It allows you to build within the IDE.
Then look for some Primers, either book or on-line.
Here is one.
Finally, practice, try, do, put the effort in.
Eventually you will be confident enough to try more advanced things that you will undoubtedly get wrong, (we all do!), and you can ask for help here!