If you are looking for a standout feature in (typically associated with versions like Minecraft 1.19 or older legacy versions like 1.8.8 ), the most useful one is Dynamic Lights .

You can hold a single torch in your hand while exploring a cave to see where you're going, saving you from constantly stopping to place them.

Makes glass blocks, sandstone, and bookshelves appear as one continuous surface rather than individual boxed blocks. Quick Download & Installation Guide OptiFine Download

OptiFine - Minecraft performance tuning and advanced graphics.

Significantly increases frame rates and reduces lag by optimizing game code.

Provides the necessary framework to run popular shader packs like BSL Shaders or Chocapic13 for advanced lighting and water effects.

Go to Options > Video Settings > Quality and set Dynamic Lights to Fast or Fancy . Other Core Features in HD U H8