I am a recently graduated student.I made a decision to become software developer,I know its weird because of current AI trend and impact on developers.But its not about that,I started learning java and moved towards SpringBoot by understanding Spring Framework's working process.In this way I encountered with implementation of authentication using Filters.I tried hard but i dont understand how to create our own custom filters and so on.

Can Anyone please share a good notes or Youtube tutorial link to help this brother to learn fast?