Grants are funds that are non-repayable often given by the government mostly to an individual. Grants are need-based, unlike scholarship that you may have to write examination which means it is based on merit. 
Grants may come from probably the federal government of your country, the state government, local government, your college or non profit organization.
Almost all grants are awarded to students with financial need.
Truly, grants do not need any repay at all but there are some requirements which needs to be met to keep the grant.
You need to be careful in finding a grant because you may not be eligible for all. I know you won't want to waste your valuable time applying for a scholarship you are not eligible for. Ineligibility is one of the reasons most people don't get to win a grant.
Ask yourself if there's a tie or match between the visions or goals of the grant anchor and your own goals and visions.
Make your researches before you apply. Pen down your needs and resources so you can get an accurate cost. Neatly get the needs and costs on paper in a wat they'll be glad to help. Be reasonable with the budget.
Don't be cut up in the corner by fraudsters when trying to apply for as many grants as possible.
Never you give a very private or sensitive information probably your credit card numbers etc to individuals you do not know. Also, be aware you don't need to pay a fee to get a grant. Many instances have occurred where individuals have been called on phone saying that they won a grant and they should pay a sum of money to redeem it. Be sure, it's a scam.
You should know that grants is mainly for academic support and you only get qualified based on your income.
You should learn how to write good grant proposals. It should be very simple, basic and straightforward.
You don't need to fill a form with your personal information, only a good, well-organized , well written and reasonable proposal is needed.
Winning the grant is just the start. You have to be sure of following up the contract agreement. Track your finance very carefully; provide necessary reports when due and make sure you meet deadlines.