It is a modpack containing some enhancments to the original minecraft experience.
Like better sounds like birds chirping and the water flowing down the river.
Some other mods are tweaks like being able to make a pickaxe out of andesite or granite.
And the most annoying thing is mining the whole tree or the entire or vein one by one, but no more. Instead go to controls
find ore excavation, then put it on a button that is easy for you to reach but not to easy so you don't accidentaly click it. After
all that hold in the button and mine the thing you want gone so now the entire tree or ore vein is gone, but be aware that
when you do it you will lose durability and hunger.
Do you like redstone? Well then there is a mod for you that gives you access to a whole library of things to use like light
sensors, entity detectors, trapdoor switches and much more.
There is also JEI which makes finding all this new stuff a snap, you will find it to your right when you enter your inventory.
There is more but you will have to find out on your adventures. :)