Please ask the details of the course contents from various institutes
and then compare. You will come to know the difference, inclusion, exclusion, purpose etc.
You can also refer to the Institute's website to know what is being offered.
After this, if you still have doubts you can write to them and have the doubts clarified.
In case of SAP, the license will be with the company you work at. They get licenses when the buy SAP. They need to pay more when they need more license. In general, each active user needs a separate license.
So you need not worry about a license.
However, the institute you learn at must have licensed software, not pirated versions.
Certification is a method under which someone tests your knowledge and certifies that you are fit to do a certain job. It's like graduation after college. The certification from SAP only is valid to the best of my knowledge. If the certificate is from elsewhere, it's a waste.
It is always good to get your SAP training done from an authorised SAP education partner. Any local computer institute will only be able to give you training on ERP, wihich comes for a much lesser cost but will add no value to your career. Also to use SAP sever, LSO and Citrix you need to do training through authorised SAP academies. After completing training you will be able to take SAP certification only if training done through authrorised SAP centres. Once you clear the SAP certification exam, you will called a SAP certified consultant, and will be able to use SAP logo on your CV, which is not possible if training done from non authorised centres. Also there are two types of SAP training available, ILT - Instructor led training, OLT - Online training. OLT comes for a much lesser cost. For more details please visit, any authorised SAP centre in your city. To get the list of authorised centres please visit SAP official website.