das Ziel
goal
A state or result in the future that one wants to achieve through one's own efforts.
Mein Ziel ist es, nächstes Jahr den Marathon zu laufen.
My goal is to run the marathon next year.

goal / destination / target
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goal
A state or result in the future that one wants to achieve through one's own efforts.
Mein Ziel ist es, nächstes Jahr den Marathon zu laufen.
My goal is to run the marathon next year.

The noun 'das Ziel' (the goal/destination/target) is closely related to the verb 'zielen' (to aim). This connection helps you understand the different meanings: you 'aim' at a result (Ziel), a place (Ziel), or an object (Ziel).
Der Jäger zielte auf den Hirsch, verfehlte aber das Ziel.
The hunter aimed at the deer but missed the target.
The meaning of 'Ziel' can often be recognized from the verbs. 'Ein Ziel setzen' (to set a goal) or 'verfolgen' (to pursue) refers to an abstract plan or aim. 'Ein Ziel erreichen' (to reach a goal/destination) can mean a plan or a place (destination). 'Ein Ziel treffen' (to hit a target) or 'verfehlen' (to miss) refers to a concrete target of attack.
Wir haben uns für dieses Jahr hohe Ziele gesetzt.
We have set ourselves high goals for this year.
To describe a goal as an action, the structure 'Das Ziel ist es, ... zu ...' (The goal is to ... ) is used very often. The 'es' is stylistically important here and makes the sentence sound more natural.
Sein größtes Ziel ist es, eine eigene Firma zu gründen.
His biggest goal is to start his own company.
When 'Ziel' means a place, the prepositions are important. 'Am Ziel sein' means that you have arrived. 'Ins Ziel kommen/laufen' describes movement across the finish line, especially in sports.
Wir sind endlich am Ziel unserer Wanderung angekommen.
We have finally arrived at the destination of our hike.
direction
'die Richtung' and 'das Ziel' can both have to do with a route or a plan. 'die Richtung' says where someone is moving or what kind of development something is heading toward. 'das Ziel' is the point or state that you want to reach in the end. They can be confused because you often need a direction in order to reach a goal. Simply put: the direction is the path or course; the goal is the end or result.

Unser Ziel ist es, bis Freitag alle Aufgaben zu schaffen.
Our goal is to finish all the tasks by Friday.
Nach dem Bahnhof gehen wir weiter in Richtung Zentrum.
After the train station, we continue on toward the city center.