Answer: Be sure to use code, (or a website builder,) that employs "grid-based" layouts for consistency. Use visual hierarchy by emphasizing important content with larger sizes, contrasting colors, or placement.
Ensure that your content is organized logically and consistently across different pages. Keep a balance between text, images, and multimedia elements to maintain a clean layout. Do not overload a page with audio and video. Also, you can store, and serve large videos from a CDN, a "Content Delivery Network," or from youTube if you have an account with them. There are other video services like Vimeo as well, which are excellent if you have a lot of video.
! IMPORTANT: Compress all of your images and any audio and/or video files so that they will load quickly. If putting multiple audio or video files on one page, make sure that it is coded correctly, so that there is no more than one audio file playing at once!