An encyclopedia is a huge set of articles full of information about many, many subjects. The encyclopedia will not give you as much information as a textbook, but it gives a good basic overview of each subject so that you will have a place to start learning. The articles are in alphabetical order, and there is an index so that you can find each one. You can either use an actual encyclopedia in a library or at home, or you can use one of the online encyclopedia systems available.
They brought horses. It was easier for them to catch up with the buffalo and hunt instead of having to throw weapons from a far and run after the Buffalo.