Personas are made up or research based profiles of prototypical users. There main purpose is to help the team emphasise with users.
A task flow is a sequence of views or screens users have to undergo in order to reach their goals. Well designed flows lets users accomplish tasks with ease.
Navigation and sitemaps used to be the domain of information architecture. Structuring content is only partly a task for user experience designers.
Wireframes structure content and functionaliy on a page or view level. Prototypes contain interactive sequences usually complete task flows for usuability testing.
Customer journey maps visualize interactions and their respective touchpoints of organisations and their customers or prospects.
User stories capture requirements for agile development. Epics function as containers for a number of user stories usually for more complex develepment tasks.