What are the most effective online advertising services for small businesse

I’m a small business owner looking to expand my online presence and attract more customers through digital channels. With so many options available—Google Ads, Facebook Ads, Instagram, YouTube, native advertising, and more—it’s hard to know where to start or what delivers the best ROI. Can anyone share their experiences with different online advertising services, what worked well (or didn’t), and which platforms are currently delivering the best results in 2025? Any tips or case studies would be greatly appreciated!