An education guide should provide scope for writing good essays. This would start quite early in a curriculum to develop skills that could help a student over his entire education program. The importance of a good guide is really noticed when competition sets in. It is at this time that you really feel the need of a background to write good essays. It is never too late to learn as this is an ongoing process.
You start with an introduction which has to include the thesis statement. This should be given a lot of thought, as it is the most important part of the essay in terms of presenting the topic. It should be compelling enough to tell the story you are trying to present. It need not be elaborated upon in the introduction itself but should generate enough interest in the reader.