Proper way to use suiteCRM

Is there any documentation on the process of using suiteCRM?

Where do I start?

What is a lead compared to a contact or when do you use opportunity?

is there any step by step instructions for the overall use of the program.

http://support.sugarcrm.com/Documentation/Sugar_Versions/6.5/CE/Application_Guide/

That’s Sugar Documentation, but for basic modules it will help you

https://suitecrm.com/wiki/index.php/Userguide

And the above link is for SuiteCRM modules

best regards

Userguides have moved to this page:

suitecrm.com/wiki/index.php/Userguide

This is a full end-to-end user guide rather than just the advanced modules.

I have also updated your post to change the URL.