Where can I get free logo icons?

Inquiring minds want to know, where can one obtain logo icons without incurring any financial cost? I'm specifically interested in finding resources that offer a wide range of professional and high-quality icons that can be used for various branding and design purposes. Are there any reputable websites or platforms that offer free logo icons that are suitable for both commercial and personal use? Additionally, I'd appreciate any tips or advice on how to properly utilize and customize these icons to ensure they fit my specific needs and branding requirements.