Write two Getting Started Guide Walkthrough's Getting Started with WebPart, I hope to help you want to develop friends in WebPart in SharePart.
Contains the following content:
WebPart concept; "Visualization" in vs.net; Simple deployment WebPart; create custom properties that can be adjusted by users in WebPart; visit SharePoint Object Model in WebPart;
Download: (1) http://blog.joycode.com/kaneboy/posts/19676.aspx (2) http://blog.joycode.com/kaneboy/posts/19914.aspx
