Basic (adjective)

1. Fundamental; primary; serving as a basis or starting point.
2. Forming a necessary component or core part of something.
3. Relating to or involving the simplest and most important elements or skills in a subject or activity.

Origin:

Mid 17th century; earliest use found in christopher wase (1590–1669), church of england clergyman. from classical latin basis a pedestal, foundation, from greek βάσις (básis) a step, foot, pedestal, base.

Examples:

1. This recipe is based on a few basic ingredients.
2. English grammar is the basic building block of language learning.
3. The aim of this class is to teach basic survival skills.
4. This course covers the basic principles of physics.
5. This guidebook will give you all the basic information you need for your trip.