It's called an independent task because you alone are the source of the information you will use to write your response.
There is no reading passage or talk to listen to, there's only the question prompt.
The TOEFL test Writing section isn't as challenging as writing a term paper, but you definitely have to prove you know how to write a few paragraphs using proper grammar, and how to get your point across clearly and convincingly. 50 minutes is the total time allowed to complete the Writing section. Your total score is then scaled to a value out of 30.
For a decent score you must get at least 4 out of 5 for both writing tasks.
Sometimes what you hear in the talk will go against what you have read rather than expanding and strengthening upon the topic.
Do NOT rely heavily on the reading passage to form your response.
The reading passage will become available again once you get to the question.
You will then hear an academic talk on the same topic.
Development is how much support do you give to your opinion. Or did you write lots but fail to actually develop your ideas? Would a person understand what you are trying to convey or would they be confused?
Language use covers grammar, spelling, vocabulary, word choice and sentence structure. Are the errors bad enough that the grader would have a hard time understanding what you mean? Nowadays, food has become easier to cook or otherwise prepare for eating. Use specific reasons and examples to support your answer.