How to Deploy Web Parts?

Deployment for Development Purposes*

1. manually copy the web part’s signed assembly (.dll) to the
   Global Assembly Cache (GAC);
2. manually add the corresponding element to
   SharePoint’s Web.config file;
3. use a site collection’s web-part gallery pages to add the
   web part.

Moving to Production (You need to create a solution package to deploy it to your SharePoint farm). For creating solution, we have to use Microsoft add-in called Windows SharePoint Services 3.0 Tools: Visual Studio 2005 Extensions, Version 1.1. Click Here to Download it.

*The preferred method for deploying a web part for an entire SharePoint web application or web farm is through a SharePoint solution.