College Application and Financial Aid application Together

Is the collge application and the financial aid application(the financial aid of the institution that i am applying) together?

When I am applying to colleges on the Common App, I do not see a tag for financial aid for that specific institution. For example, I am applying to Stanford on Common App and I want to apply for the financial aid offered by Stanford, but there is no tags under the application about applying to the financial aid at this institution. Should I just do the application at the official portal of the school or what?

You just need to apply for financial aid as per the instructions on Stanford’s website.

No. You will need to complete the college application and the FAFSA and maybe the CSS, depending on the school. Look at the college financial aid pages.