Primary resources
This is a concise description of free body diagrams;
Here is a chapter from the OpenStax textbook related to free body diagrams;
Secondary resources
Follow along in this interactive tutorial by W.W. Norton & Company about FBD;
Here is a slideshow demonstrating how to use free body diagrams with examples
Three part video series from the people at physics help.
Other Resources
If you still have any doubts about FBD and also need a little more info on the types of forces we are dealing with watch this video;
Vector free body diagrams Physics Lesson,
https://www.youtube.com/embed/BuPfDI7TyL0
Follow along in this interactive tutorial by W.W. Norton & Company about FBD;
www.wwnorton.com/college/physics/om/_tutorials/chap5/freebody/index.htm
Here is a slideshow demonstrating how to use free body diagrams with examples,
https://www.wisc-online.com/learn/natural-science/physics/tp1502/constru...
Three part video series from the people at physics help.
https://www.youtube.com/embed/jHCsMXpYGAc,