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.

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

And the above link is for SuiteCRM modules

best regards

Userguides have moved to this page:

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.