What is the best course to start to get a certification here in salesforce?

should start with the Admin Certification. My opinion for the newbees is always ADM201 to get the understanding of the platform and system.

Once you are familiar with the system then make your way if you aspire to be a sfdc developer then go for Platform developer.

If interested in administration or business analysis and no coding then go for Admin, business analyst career path. 

Salesforce recently launched salesforce associate certificate for those who has very little knowledge on salesforce. You can read about this certificate here - https://dineshyadav.com/salesforce-certified-associate/

https://www.salesforceben.com/salesforce-associate-certification-guide-tips/

https://www.udemy.com/course/prepare-for-the-salesforce-certified-associate-exam/

so first go for salesforce associate certificate then adm201 and then based on your career path you can decide either developer, admin or business analyst

Hope it helps you