Lonely Planet online is a website based on the Lonely Planet travel books. This link will bring you directly to the travel information page about Nigeria. Here you will find a good deal of travel information to start your exploration of Nigeria. The information is organized in the same manner as the books (which you can also order online here). The background info is organized by topic: Weather, Health & Safety, Government, People & Society, Culture & History, Time & Place, Crossing Borders, Money, Events and Transport.
Wikitravel is an excellent user generated travel guide supervised by administrators. On the Nigeria travel page you will find the following travel topics: regions, cities, entry requirements, getting out, languages, eating, drinking and sleeping, learning and working in Nigeria, health and safety, respect and contact. Information on site is mostly updated. However, we suggest you always check the travel advice from your own government first, before leaving your country.
WTG has many travel guides about all countries in the world. The guide about Nigeria provides information and articles for tourists. On the left the guides are sorted by theme. The menu on the right side provides the table of contents for Nigeria: overview, adresses, money, duty free, public holidays, accommodation, going out, map, images and more. You can also create a miniguide that you can print.
This guide about Nigeria is made by travelers for other travelers and tourists. You can edit this World66 guide by clicking on the  button. The Nigeria guide covers the following travel themes: general travel information, map, history, practical info, economy, health, people, books and a photo gallery.
On the site of WorldTravels you will find detailed guides about a lot of countries, regions and cities. In the menu on the left you will find the city and region guides. All guides provide information on the following topics: introduction, facts, health, contact, airports, map, weather, currency, visa, photos and flights.