Elliott from Laser Red wrote a round up of helpful WordPress functions that you don’t usually read about:
- get_post_field
- wp_list_pluck
- antispambot
- checked/selected
- body_class
- human_time_diff
- wp_send_json_success/error
- wp_remote_get/post
- get_template_part
If you’re a WordPress dev, I really suggest you check out this article, because he gives an explanation and code example for each one of these in an a quick, easy to read format.