Start-ups or start-up companies are newly founded companies. (“Good, innovative idea and limited financial resources”.)
They need capital to build their business. The capital can be given by investors (family and friends, business angels, venture capital companies, etc.) in the form of equity against business interests but also in the form of debt (loans). Whether equity or debt is the cheaper needs to be calculated and depends on business operations and future prospects.
Bank loans are usually not enough for start-up companies. Public funding in the form of national or state guarantees can help here, however, always with the condition that it is a project worthy of “economic” support.