AlAan Media
Choose your aspect ratio before you shoot. Horizontal 16:9 suits websites and long documentaries, while 9:16 fits mobile feeds and stories. A square or 4:5 frame often performs well in social timelines. Shooting in a higher resolution than you need gives you room to crop for each platform without losing quality.
For web delivery, export in a widely supported codec such as H.264 with a sensible bitrate, then test loading speed on a mid-range phone over a slow connection. Provide captions, keep the file size proportional to its length, and lazy-load videos below the fold so they do not slow down the first screen.