Signposting is a really useful tool to help you structure your essay and provide clarity for your reader.
Signposting can be divided into two broad categories:
These highlight key aspects of the work, such as purpose, structure, author’s opinion, main points, direction of the argument, conclusions.
Examples of major signposts:
These show connections between sentences and paragraphs.
Examples of linking words and phrases:
Depending on your essay question and/or length, subtitles may be another useful signposting tool. They are a clear indication to the reader about what the following paragraphs will be focusing upon. It is worth checking that your subject discipline encourages the use of subtitles.
Be careful that you use signposting and subtitles correctly as having too many and using them incorrectly can be  confusing to the reader and may lose you marks.