It is a good idea to have a variety of logo sizes in a specific folder for quick access. You will need a specific size for your main menu, your fixed menu (if you choose), and your favicon. A favicon is an icon that sits alongside your title tab browser.
Fig. 1. Favicon sample
Your favicon is very small, and you can create one at https://www.favicon-generator.org/ . It’s best to use a single image, which could mean just using the picture part of your logo, without any wording.