answering your questions, anidb is just a way to keep your anime and files organized (it can also serve as an informant of newly released files) just that, you start by going to the anime page of the anime you want to add files and choose the ones you have, click add and they are in your mylist, if the file doesn't exist in the db, you have to manualy add the file, unless you are prety sure your file is corrupt, in that case don't add it.
AOM/webaom is a program to scan a dir of files (or just files), compute their hashes, comunicate with anidb and automaticaly add those files to your mylist under the correct anime (it can also rename your files if you so configure), in the circunstance you have a file that does not exist in the db you will have to add it manualy through the web interface, again if you suspect that your file is corrupt, don't add it, use a generic file (on the web interface).
As for using indigo as your text color, you are obviously free to use so, though it can cause avoc in some people senses
As for rar being a troll, we all know about it, you just have to live with it
btw, i would first search the wiki for information, then the forum (because if you search the wiki first at least you should have a bit of background on the terms used, so you can formulate a good search query)
