For every WordPress developer, it’s essential to have a brief idea about different WP Query functions and they must even know where to call the functions within the coding.
The infographic explains two important WordPress Query Functions in a nice manner.
Query_Posts: This function is mainly used whenever a WordPress developer plans to modify the most important query of a page. It calls in wide set of global variables and will generate staggering bugs and errors if placed improperly at any point of the code.
Get_Posts: This query function has similar mechanics like query_posts function and will accept same list of arguments that are passed through the query_posts function. To call this function, the WordPress developers need not modify any global variable and it can be placed within coding part without any issues.