I suggest that you buy an English dictionary which will help you to understand the differences between the meanings of words Otherwise this online English dictionary is very helpful for the meanings and the pronunciation of words/synonyms/idioms: www.thefreedictionary.com

A goal is a target or a desired result. The aim is the process of orienting yourself and your actions towards a goal or an ambition. An aim is like a relatively long term plan of action. When you aim, you try to see the bigger picture. The goal is the final point or level to reach at, and doing so in a sense brings closure to the aim that you had some time ago. Often, goals form subsets of the aim itself. Let’s say you’re fascinated by hybrid cars and want to come up with one yourself. Your aim then becomes to get to see your ideas up and running on the roads. How do you go about it? You set yourself small goals, carefully thought out to achieve the said aim. These goals can be designing the engine, selecting the fuel, designing the car itself and so on. Each and every component once completed forms the whole, and the job is done. Goals can thus form stepping stones which then come together to make up a stairway that finally leads to the aim.

Goal is more broad than aim, aim is more specific. you nomally need to achieve several aims to reach the goal. Am I right? Goal is the purpose toward which an endeavor is directed; an objective. Aim more mean to direct toward an intended goal.“to turn something in the direction of an intended goal or target''.

目的 － aim, goal (figurative) (名詞) 瞄準 － to aim (動詞) 球門 － a goal (名詞－足球） 進一球 － to score a goal (足球)

A goal is something you work toward, a long-term setpoint of what you want to accomplish. An aim is a focal point, something to keep your eye on for now. So you could aim to be perfect in an exam but your real goal is to graduate from school.