Agile Scrum has become most popular delivery model and methodology, bootstrap yourself for it and use it in real life.

Agile model of software development and delivery using Scrum methodology has become very popular in today's time for product, project and service delivery. Many teams like software engineering, development, testing, services and others across the world from startups to big old corporations have moved to this and are able to keep teams happy and do a highly effective delivery with great flexibility. It is therefore very important for you to bootstrap yourself for it to be well versed with it and also even if you are already working in such a model to brush up yourself for various aspects of it. It is essential to understand things like:

Agile Manifesto,
Agile Principles
User Story
Story Point
Sprint
Sprint Planning
Release Planning
Burndown Charts
Product Backlog
Sprint Review