How can a fight be good?

• “This may be called a "good fight", because it is in a good cause, the cause of God and truth; and under a good Captain, Jesus Christ the Captain of our salvation; for which good weapons are provided, even the whole armor of God, and which are not carnal, but spiritual and mighty; to which may be added, that those who are engaged in this fight may be sure of victory, and the crown of glory, life, and righteousness.” -  John Gill

We have salvation, a free gift we did not have to fight for, however, we will have to fight our way all the way to Heaven. Notice I said fight to Heaven, not for Heaven/salvation.

Unlike popular opinion, our fight is not with our co-worker, spouse, friends, non-friends, children, our boss, the government officials, the social media influencer, the false teacher, the person who cut us off in traffic. No, our battle isn’t with the seen, but the unseen:

• For we are not fighting against flesh-and-blood enemies, but against evil rulers and authorities of the unseen world, against mighty powers in this dark world, and against evil spirits in the heavenly places.
  Ephesians 6:12

• For we are not wrestling with flesh and blood [contending only with physical opponents], but against the despotisms, against the powers, against [the master spirits who are] the world rulers of this present darkness, against the spirit forces of wickedness in the heavenly (supernatural) sphere.
  Ephesians 6:12 (AMPC)

Know your enemy.

• For we are not fighting against flesh-and-blood enemies, but against evil rulers and authorities of the unseen world, against mighty powers in this dark world, and against evil spirits in the heavenly places.
  Ephesians 6:12

Know your weapons and how to use them.

• Put on salvation as your helmet, and take the sword of the Spirit, which is the word of God.
  Ephesians 6:17

Know that we are winners.

• For everyone who has been born of God overcomes the world. And this is the victory that has overcome the world—our faith.
  1 John 5:4 (ESV)

Know Who has overcome the world giving us ultimate victory.

• I have said these things to you, that in me you may have peace. In the world you will have tribulation. But take heart; I have overcome the world.
  John 16:33 (ESV)

Christianity.com: Fighting The Good Fight

The true fight is very impactful to me. I spend too much time fighting fights that I should not fight.

Focus on the right and true fight.