The order matters, because the cheap steps resolve most cases and the expensive ones are rarely needed.
1. Reverse image search, on more than one engine. This resolves the majority of shared images in under a minute. You are looking for the earliest appearance and for versions without the interesting element. Different engines index differently, so a miss on one is not an answer.
2. Look for the unedited original. Composites are usually built on a stock photo, and stock libraries are indexed. Finding the same road without the tree is conclusive and takes no expertise.
3. Read the image's own internals. Sometimes there is metadata giving a camera, a date, a location. Absence proves nothing — social platforms strip it — but presence occasionally hands you the answer.
4. Check the scene against maps. If the claim names a place, satellite and street imagery either shows the feature or does not.
5. Only then look at pixels. Error level analysis and similar tools are the last resort, they require interpretation, and they produce confident-looking output that is frequently misread.