There's a part of aerodynamic drag that I don't see explained very well and it's incredibly important to understand it. That's what this video is about. Once you understand the concepts of this video and the previous one on lift you'll have fundamentals you'll need to be awesome in DCS.
If you want a written guide on this topic (and more) from an authoritative source then check out the FAA's Pilot's Handbook of Aeronautical Knowledge. Free download linked below.
Pilot's Handbook of Aeronautical Knowledge
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak
How Lift Works:
https://youtu.be/I-7NHsYRkGk
Obligatory disclaimers:
The presence of DOD Visual Information in this video does not constitute endorsement by the DOD or any of its departments. Any views expressed by the presenter are those of the presenter and do not represent the views of the DOD or any of its components.
Attributions:
Turbofan animation/ NASA Public Domain
NASA - http://www.grc.nasa.gov/WWW/K-12/airplane/caxiala.html
Winglet
http://www.dfrc.nasa.gov/Gallery/Photo/KC-135/HTML/EC79-11481.html, Public Domain
Winglet drawing
By Olivier Cleynen - Own work, re-using 737-NG rear view.svg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=20009559
Wing Aspect Diagrams
By Steelpillow - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=7803417
https://commons.wikimedia.org/w/index.php?curid=7768908
https://commons.wikimedia.org/w/index.php?curid=7768916
High AR Glider
By Manfred Münch - Originalfoto Fa. Alexander Schleicher, Mail Uli Kremer 20090423, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=6611520
Second High AR Glider
By Britta Pulz - via e-mail from photographer, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=18438635
Piper Cherokee
By Arpingstone at English Wikipedia - Own work by the original uploaderTransferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=2694283
Concorde
By Arpingstone - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=140252
F-14
By U.S. Navy photo - This image was released by the United States Navy with the ID 051105-F-5480T-005 (next). Public Domain
F-111
By Master Sgt. Patrick Nugent - flickr, Public Domain, https://commons.wikimedia.org/w/index.php?curid=109575695