Marketing Cloud API

Intro to Marketing Cloud APIs
REST API
SOAP Web Service API
SOAP API Performance
Get Started with the SOAP API
Work with SOAP Web Service API
Methods
Objects
Simple Development Scenarios
Supported Operations for Objects and Methods
Technical Articles
General
Administration
Asynchronous Processing
Automation Studio
Campaigns and Programs
Code Samples by Language
Data Extensions
Emails
Filters
Groups
Import Definition and Activity
Portfolio
Copy an Image from a Website into the Portfolio
Create a Portfolio Object
Retrieve an Item from Your Portfolio
Select the Contents of a Portfolio Folder
Scheduled Messages
Send Definitions and Email Message Interactions
Subscriber Attributes
Subscriber Lists
Subscribers
Tracking
Triggered Sends
Marketing Cloud for Appexchange API Guide
API Best Practices and Use Cases
API Errors

Portfolio

The following are portfolio articles for SOAP API.