Components are plain data structures (classes or structs) that contain data relevant to a specific aspect of an entity. They don’t have any logic or methods. Examples of components could be a “Position” component containing x, y, z coordinates. Create a Position component with 
bolt component position
which will add a new component to your workspace: 
use bolt_lang::*;

declare_id!("Fn1JzzEdyb55fsyduWS94mYHizGhJZuhvjX6DVvrmGbQ");

#[component]
#[derive(Copy)]
pub struct Position {
    pub x: i64,
    pub y: i64,
    pub z: i64,
}