The literal meaning of tap into is to make use of a resource, such as water, oil or gas. However, tap into can also be used figuratively to mean make use of a resource such a the knowledge or experience of an older relative. This idiom could be used in a part 2 IELTS problem solution essay. For example, these days many young people struggle to manage their money, what could be done to help individuals learn to manage their money more effectively?
An example is show below:
One way we can improve our ability to manage our money is to tap into the financial knowledge and experience of our elders.