Hi@akhtar
You can find lots of resources available in google. But I would suggest you to go through the below links. It covers all the basic to advance concepts of Jenkins. Further, they explain with some industry related use-cases which makes it easier to understand the pipeline concepts.
https://www.youtube.com/watch?v=p7-U1_E_j3w
I suggest you to to go for DevOps Certification as it will create high impact on your career. You may view the course details in the link given below.
https://www.edureka.co/devops-certification-training
Hope this is helpful.