Yes of course.
Backend is a really deep concept, that goes from Database to Monitoring to deployment to API design. Pick an initial path (e.g. LAMP stack - Linux Apache MySQL PHP for instance, one of the most used on web, rich of resources and documentation) and try to design your DB Schema + API. Start without a framework just to learn the basics, then don't reinvent the wheel and stick to one of the existing Rapid Application Development Frameworks. It will go faster
