Further is used to indicate a greater extent or degree in a variety of contexts. For example, “I need to further research this topic before I can write my paper” means that more investigation is required. To use further in a sentence, simply place it before an adjective, adverb, or verb to show that something is being extended or advanced.

Further should be used when extending your point from a previous argument already made. Furthermore should be used when you’re introducing a new argument. Further is used in the middle of a sentence, while furthermore is used at the start of a sentence.