Some obvious, some not so. This recent article describes in little detail 20 ways to raise money for your business.
While it provides some good ideas, they’re not fleshed out and additional research is needed to make the discussion helpful to most entrepreneurs.
The better ideas include crowdfunding, friends & family, “customers” (by which she likely means pre-sales), and working with universities.
Some ideas not worth pursuing include asking people to pay you to work for you (likely illegal where there are minimum wage laws), and trying to get money out of institutional mutual funds that typically don’t invest in startups.
Good start; need more info.