Many beginners are confused by the word "ground" in electrical schematics and in electrical construction. The word's meaning is found by looking at its context. If it is found on a schematic for a simple microprocessor, audio, or control circuit, then it merely means that all the points on the circuit labelled ground should be connected together with conductors. In such low frequency circuits the conductor is usually just some wire or copper plating on the pcb, whatever is most convenient. The shape and length of the wire or copper trace is usually up to the designer and may be any shape. However, there are electrical benefits to keeping the ground wire or conductor as short as is practical or convenient.
If you are building machines or circuits for managing power in the AC mains, then "Ground" may refer to earth ground. This literally means that the point called "ground" should be connected with wire into the dirt and rock beneath your feet. The likelihood of a hobbiest or student needing this kind of ground is effectively zero. Well, that is, other than connecting your project's metal chassis to the ground lug on your line cord that is.
In high frequency electronics, a "ground" is also a common point to which all nodes labelled "ground" get attached to by conductors. However, best performance is achieved when the conductor is a large flat plane of metal laid parallel to the circuitry. Ground planes of this sort are essential in all RF electronics, and all high speed computer printed circuit boards.
So, my answer to your question is: any way you please, as long as all points labelled "ground" are connected together with good conductors