To make sure your images show up when someone else opens your .html file, you have a couple of options. You can upload your images to a hosting site like Imgur, PostImages, or Google Drive, and then use the link to those images in your HTML file. Another option is to send the HTML file along with the images in a zip folder. Just make sure both the images and HTML file are in the same folder, and when they unzip it, everything should load properly. If you want your webpage to be online, you can host it on platforms like GitHub Pages, Netlify, or Google Sites so anyone can access it without problems.