Forget about complex long sentences when crafting an informal essay.Instead of difficult constructions, you are expected to use simple, clear and concise sentences.Only having a clear picture of who your reader is, you will be able to write the introduction that will catch the reader's attention.
The main reason is that this type of essay provides you with the freedom to choose the topic you are interested in, use the informal style of writing, and reveal your personality.
First, you may think that you can write the way you like without following any rules. There is a particular structure you should stick to complete a high-quality informal essay.
Formality exists on a scale—in the example below, a letter of application to a known colleague can result in a semi-formal style.
Here is an example: Formal (Written to an unknown audience): I am applying for the receptionist position advertised in the local paper.
Keep in mind that it should be interesting for both you and your target audience.
This kind of essay allows demonstrating your own personal character to the full extent. If you want to reveal your personality through the informal essay, you are recommended to brainstorm ideas on how to express your way of thinking and the attitude toward the world with the help of words.
Summary: This handout will cover some of the major issues with appropriate language use: levels of language formality, deceitful language and euphemisms, slang and idiomatic expressions; using group-specific jargon; and biased/stereotypical language.
The level of formality you write with should be determined by the expectations of your audience and your purpose.
It is obvious that an informal essay shouldn't contain any scientific terms.
To cut a long story short, you should imagine that you are talking to a friend and sharing your personal point of view on the specific issue, brainstorming problem solutions aloud organizing ideas in an understandable way. The beginning of any paper should be attractive for the reader if you want him/her to hold on reading.