Learn English – Equal vs Equivalent: Finer differences in meaning and usage? in 4 distinct scenarios outlined

Targets implies a numerical goal. Usually you hear this in sales meetings, as in "Our Q4 target for the sales team is $12M."

Goal is a bit broader and more general. Where target may imply a very specific goal, goal can be broader. You can say "My goal is to lose weight this year," but using target there would sound odd because the general concept of losing weight isn't specific enough for that word. You would more likely specify a quantity, as in "My weight-loss target is 15 lbs."

Nevertheless, you could use the two interchangeably. There is nothing wrong with saying "Our Q4 goal for the sales team is $12M."

"Apt" and "fit" are generally not interchangeable, as one or the other tends to be preferred in a given context. I think the degree of specificity is what distinguishes them. "Fit" tends to means "well-suited to a particular purpose", while "apt" means "well-chosen" or "appropriate" in a more holistic sense. Here are some examples:

• "This was an apt observation, given the events that followed." The observation was especially well chosen in context, not for any particular purpose, so "fit" doesn't really work here. However, "fitting" could be used.

• "The survey was designed to determine which candidate was most fit for the job." Since a specific purpose is cited, "fit" works better than "apt" here.

• "Joe proved an apt pupil, quickly surpassing his peers." Here, "apt" is used to mean "skillful" in a general sense, without any particular purpose.

• "Only the most physically and mentally fit students can become underwater basket weavers." Here the two words are pretty interchangeable, although perhaps "adept" would be better than "apt".