Original thread found in FE Modding by Heavenfall (or, even older, in WOM Mods!). I think this is the sort of information that needs to be passed on to newcomers. I've slightly edited the content (and added one more tag) but I think it's still fairly close to the original.

In the old E:wom forum we used a series of tags on our posts to tell the user what the status was of the mods. The idea was that the user should be able to tell, at a glance, what was inside the thread. It was also meant to simplify searching for the modder - for example, he could search for the tag eINFO and find all the various pieces of information. The system was detailed by Gazz_ ...

[eMOD] Mod
- A mod released to the public in whatever shape you feel fit for release;
- If current version and date of release are not in the main subject, the subtitle would be a good spot for those;
- Adding a second tag for [eWIP] would be pointless because practically every mod is and stays "work in progress" forever;
- eMOD and eWIP should therefore be mutually exclusive.

[eWIP] Mod
- Work in progress but not deemed ready for a public release, yet.

[eLIB] Library
- Libraries can cover pretty much anything but are (usually) completely pointless for the end user to even look at;
- This is technical stuff from modders for modders (e.g. Created models or icons for use as map tiles, altered textures, scripts, items, etc.;
- Basically, anything that is designed to be included in other mods and/or scripts.

[eINFO] Information
- Often enough it happened to me that I remembered that someone posted some important info about how to hammer a particular round peg through that square hole in the game engine. Alas, those gems are terribly hard to find when you don't know the exact wording. Being able to filter all such posts would be more productive.

[eTUT] Tutorials
- In principle the same as eINFO but more verbose - a tutorial rather than a critical bit of information.

[eUTIL] Utility
- A tag for tools that help with something like creating XML or exporting textures to .dds

[eTOOL] In-game Tools
- A tag for in-game modding tools (e.g. The Modders Vault - Unlocking all in-game items)

I think it would be great if people used these tags for LH as well. Some mods may require multiple tags, in which case it's simply [eMOD/eLIB] and so on.

Also, I would generally recommend that you put in the thread title what version of LH the mod is for. For example a title might be:

[eMOD] [LH 1.8] ExpandedFactions (2015-01-31)

This allows the users to quickly avoid mods that stop being updated as the game is updated.