Visa types granted by Nigeria are;

• Nigeria e visa
• Nigeria Tourist Visa
• Nigeria Diplomatic Visa
• Nigeria Long-stay Visa
• Nigeria Subject to Regularization Visa
• Nigeria Business Visa
• Nigeria Visiting Family and Friends Visa
• Nigeria Short-stay Visa
• Nigeria Journalist Visa
• Nigeria Transit Visa
• Nigeria Visa On Arrival
• Nigeria Conference Visa
• Nigeria Employment Visa
• Nigeria Entry Visa
• Nigeria Medical Visa
• Nigeria Project Visa
• Nigeria Research Visa
• Nigeria Student Visa

Here are some articles that might help you. Check them out!

• Overview Of The Different Types Of Visas Available For Travel To Nigeria
• Overview of Nigeria Visa Policy
• Nigeria Visa Through Embassy
• Required Documents for Nigeria Visa
• Nigeria Photo Requirement
• Nigeria Visa Fee & Cost
• Nigeria Temporary Work Permit