Hello! A thesis is a statement, usually made before completing a science experiment or project, that predicts the outcome. A thesis is an educated guess, meaning some background information would help with accuracy.
A thesis in writing would be called an assertion. Usually, it is the last sentence at the first paragraph in an essay. It depends what you are writing about, but in the assertion, you state what you are trying to prove in the essay. For example, if you are writing a persuasive essay, it would be your opinion. Throughout the essay, you would have multiple "mini-assertions," with evidence to back them up.
I hope this helps. :) Let me know if you have any questions!
