Salesforce provides two types of services, namely, Platform as a Service (PaaS) and Software as a Service (SaaS). If you want to learn in detail about the services, you can read about it in Salesforce Tutorial. Salesforce as SaaS allows you to create workflows and objects while as PaaS, it provides a platform to develop.
You can get good training in Intellipaat’s Salesforce Certification where you will have online assistance available all the time, free courseware through lifetime, course completion certificate.
You can learn about Salesforce by watching this video on Salesforce Training: