What is the basic way for all corporate enterprises to raise funds by themselves?

Absorb direct investment, issue stocks, and retain profits.

1. absorption of direct investment: absorption of direct investment refers to a financing method in which enterprises directly absorb the capital invested by the state, legal persons, individuals and foreign investors in accordance with the principles of * * * investment, * * * operation, * * * risk and * * * profit.

2. Stock issuance: Stock issuance refers to the behavior of qualified issuers to issue shares to investors or original shareholders in accordance with legal procedures to raise funds.

3. Retained income: Retained income refers to the internal accumulation retained by the enterprise from the profits realized over the years, including surplus reserves and undistributed profits.