Somebody was asking me this week about version numbers and it reminded me to share this quick tip with you guys...
Some mods have their own version number that is separate to the version number of Minecraft with which it's compatible. So the mod might be made to run with Minecraft 1.7.2, but the version of the mod is 1.6.5. This can be really confusing, especially if you're new to all this mod stuff.
Taking the popular mod Oceancraft as an example, you can see in this screenshot from the Minecraft Forum that the current version of the mod is 1.4.1 which is compatible with Minecraft version 1.7.10. This one is clearly spelled out and easy to understand, but they're not all that well worded.
Likewise, the Forge version number is separate to the version of Minecraft with which it's compatible. Also there is usually more than one version of Forge for each version of Minecraft. You can see from this screenshot that there are two versions of Forge for Minecraft 1.7.10, the latest version being 10.13.2.1258.
So what does any of this mean? Well it's just something to keep an eye out for if you're having trouble loading or running mods. Knowing where to look for the version number of the mod or Forge will help you get the right one, and find the right answers when you're troubleshooting the problem.