If you are looking for the specific extras included in your edition: : An exclusive cosmetic alien race. Digital Soundtrack : 2.5 hours of music.
: Growth is the most critical metric. Colonize guaranteed habitable worlds quickly and consider manual resettlement to hit "growth ceilings" faster. Stellaris: Galaxy Edition [v 2.7.2 DLCs] (201...
: Keep them busy by using the "Assist Research" action on your home planet and core colonies to gain significant tech bonuses. If you are looking for the specific extras
: Prioritize using the "Map the Stars" edict as soon as you have enough Influence to boost anomaly discovery chances. : In this version, Habitats are highly efficient
: In this version, Habitats are highly efficient for resource production. Build them over mineral or energy deposits to unlock specialized districts for those resources.
If your version includes the DLCs released up to mid-2020, here are the most impactful ones: Video :: Stellaris 2.7.2 - Guide - Habitat Management