Waging Wars is all well and good but lets take a look at some tactics that competitive players use for waging defensive wars.
Note: This does not include the FTL jump exploit but I should note there is a version of it that is not exploit imo, which is setting the home system for your fleet to be away from the battle lines during war.
00:00 - Intro
1:36 - Slow The Enemy Down
2:49 - War Doctrine: Hit & Run or Defense in Depth
3:05 - Quick Lesson in Fleet Combat Mechanics
4:24 - Tactic 2: Reinforce Ground Troops
5:49 - Tactic 3: Counter Attacks
6:51 - Things to Keep in Mind