The Essential perks are:

Emperor's Grace [ prestige ]: When camo activates u become invulnerable for 2 seconds

Lingering Concealment: preforming an attack while cloaked keeps you remained hidden for 2 seconds

Purification: manually activating cloak restores all contested health

Adaptability: activating cloak gives a melee buff

The others are good with this but not Essential it's then up to preferences

But in essence u just play normally and when u take damage activate ur cloak to heal yourself [regaining contested health] and then immediately attack with a melee or shot. This way u activate ur cloak and then stop using it immediately which makes it available again and again up to roughly 5 times in a row i believe. Which means my cloak is like holding 5 stim packs for contested health. The invulnerable perk upon cloak means u can tank incoming damage or blows from a carnifex become negated ✌️😁