If you see questions that frequently come up here, in another area or even other sites, let me know and I'll add it here if appropriate.
This is NOT a question-asking thread. You asking a question is not considered a "frequently asked question" and will not be added to this list unless it really is asked a lot by people.
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Category: Playing Fallout 3
Question: Is there a way to acquire both homes at the same time? (Tenpenny Tower and Megaton)
Answer: Not by design. This would require a mod or using console cheat commands.
Question: Is there a flashlight?
Answer: Yes. Hold the button for your Pip-Boy (Tab on PC, B on Xbox 360, O on Playstation 3).
Question: Are there Console / Cheat Codes?
Answer: Look here.
Category: Modding Fallout 3
Question: How do I install mods?
Answer: Follow the tutorial called Fallout 3 beginners guide
Question: Is the XBOX 360 Moddable? Can I load mods on my XBOX 360?
Answer: No. Even if you managed to copy the files, the architecture is different and done this way to ensure it will not work. Microsoft is the one responsible for not allowing user-made content on the XBOX, not Bethesda. You will only be able to add official add-ons made by Bethesda which are typically called a DLC (Downloadable Content)
Question: Is there a Construction Set? Where can I get it?
Answer: Yes, there is one and it was released on December 11, 2008. Get it here.
Question: Where is the wiki page again that has tons of tutorials and specifics about the GECK?
Answer: http://geck.bethsoft...x.php/Main_Page.
Question: Am I allowed to port / import content (models, textures, audio) from a different game into Fallout 3?
Answer: No. It is not allowed to port content from one game to another. The only exception is if you have direct permission from the Intellectual Property (IP) holder. Do not upload ports to the Nexus because they will be deleted by the admin and consequences will follow.
Category: Mod Troubleshooting
There is not currently a section built for this but since this is VERY similar to Oblivion, a good reference is this: Oblivion Mods FAQ. There is also a "How to install plugins" section which is very similar to Fallout 3 since they are basically the same process.
Category: Modding Tutorials
Here are some articles but more can be found in the Article Database
Skree's Easy Skinned Armor Nifskope Tutorial
How To Add Glow Maps
Retexturing Made Easy with Photoshop
Edited Textures Working In Game! Here's How
Modelling without Developer support
How To Load Hair Models Made For Oblivion Into Fallout 3
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Last Updated On: June 22, 2009
Staff edit - 17/02/2015 - Changed dead Installation link to a more up to date working one.