As e-learning continues to gain popularity worldwide, many platforms have emerged offering extensive, in-depth tutorial skills online. These programs provide a vast range of skillsets, across numerous industries and knowledge levels, making them a valuable resource for personal and professional development. Today, our guide will help you identify the right platforms for these services.

The first factor to consider is the quality of tutorial content. High-end platforms provide well-structured, comprehensive tutorials designed by experts in the specific areas of study. They contain accurate, digestible information and are presented in a manner that is easy to understand. These programs often integrate quizzes and tests for learners to assess their understanding of the tutorial content.

Lynda is a prime example of a platform offering high-quality tutorials. Lynda tutorials are designed by industry experts and feature an extensive library covering a multitude of fields. Additionally, they offer practice enrichment exercises for you to hone your skills after each tutorial.

Besides the quality, the variety of tutorial offerings is another important factor. The platform should offer a wide range of tutorials across diverse fields such as IT, business, graphic design, music, and art. This ensures the platform caters to different user necessities and career paths.

In this regard, Udemy stands out. It offers an exhaustive catalogue of tutorials, featuring thousands of courses in a multitude of disciplines. With Udemy, users can gain expertise in just about any field or scope.

When choosing a platform, consider the teaching methods employed. Ideal platforms use various instructional methods to cater to different learning styles. Platforms which offer video content, interactive quizzes, practical exercises, and forums give learners a holistic learning experience.

Coursera offers a mix of these teaching methods. Courses here include recorded video lectures, peer-reviewed assignments, community discussion forums, and an opportunity to share your achievements with a shareable electronic Certificate.

Also, an interactive interface is crucial. A user-friendly interface ensures seamless navigation through the platform, enabling learners to focus on the content rather than troubleshooting technical problems.

Khan Academy provides an illustration of this, with a simple, easy-to-use interface. This allows learners to get started quickly, navigate through different courses, and track their learning progress without hassle.

The next factor to consider is price. While there are platforms that offer free classes, others require a subscription to access their content. It's essential to choose a platform that offers good value for money.

Platforms like Codecademy offer a unique blend of both, with free access to basic content and a Pro version for more advanced tutorials. This gives learners the flexibility to select the plan that best fits their budget and learning needs.

Lastly, consider the platform's reviews and reputation. A platform with positive reviews not only indicates a user-friendly interface and high-quality tutorials, but also the level of trust it enjoys among learners.

For instance, Mozilla Developer Network (MDN) enjoys positive reviews for its comprehensive programming and web development tutorials. The fact that it's run by Mozilla, the organisation behind the popular Firefox browser, adds to its authenticity and trustworthiness.

In conclusion, the right platform for in-depth online tutorial skills goes beyond just offering information. It should involve quality content, a variety of courses, effective teaching methods, an interactive interface, affordability, and hold a positive reputation. By considering these factors, you can select the platform that suits you best and journey confidently into your e-learning experience.