How can I add my logo for free?

For those interested in adding their logo for free, I'd like to inquire about the process. Is there a specific platform or service that allows for this without any cost? Are there any limitations or restrictions to consider, such as logo size, format, or resolution? I'm particularly interested in understanding how I can seamlessly integrate my logo into my online presence, whether it's on a website, social media, or other digital platforms. Additionally, I'd appreciate any tips or best practices for ensuring my logo is properly displayed and recognizable across different platforms.