If you want to learn more about querying, here are some helpful posts from the Operation Awesome team:
Query-Writing 101: Writing a Basic Query
Query-Writing 102: Query DOs and DON'Ts
When Should You Write Your Query Letter?
How Many Query Letters Should You Send?
Four Great Query Resources
Using Social Media for Query Research
Where do you go for Query Feedback?
The Agent Research Spreadsheet
Building Your Writing Bio with Short Story Credits
5 Ways Unpublished Writers Can Make Themselves More Attractive to Publishers
Pitching to Agents (guest post)