how can I get the list of tickets that I worked on ?

[Abilash]

How to check the number of tickets worked by user and i worked on in jira?

[Evgenii]

Hi, @Abilash 

Welcome to Atlassian Community!

Just use JQL like:

assignee WAS currentUser() OR assignee = currentUser()

It will give you all issues, where you was or is an assignee. If you need to find issues by user, just replace currentUser with required user.

[Nikola Perisic]

Welcome @Abilash 

You can use the For you option if you are on new UI and Your Work if you are on the old UI, then select tab Worked on.

For the other user, you would need to create a filter - this depends what data you need, that user as a reporter, assignee?