Generally the amount of money is small and is aimed at assisting with living costs, fees, course equipment, travel, childcare, etc.
There are thousands of trust funds, so you need to find the one that matches your personal circumstances - do not waste time and money by applying to trusts that are not relevant to you.
You may find it useful to check the following:
- Directory of Grant Making Trusts published by the Charities Aid Foundation
- Grants Register published by Palgrave McMillan
- Charities Digest published by Waterlow Professional Publishing
The above digests can usually be found at larger public libraries and some university libraries.