What can one do better after learning about a subject?\nOptions:\n- form opinions\n- change\n- headache\n- advance\n- start reproduction
Let’s work this out in a step by step way to be sure we have the right answer.
form opinions
Form opinions is to make up one’s mind or decide what one thinks about something or view or judgement formed about something, not necessarily based on fact or knowledge.

One can form opinions better after learning about a subject.

.

So, the answer is form opinions