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A Simplilearn Certificate Goes on LinkedIn Each Minute; Here’s How Krishna Kumar Built It From a Blog

17 years ago, Krishna Kumar started offering free PMP prep online. Today, it’s a leading digital upskilling platform that helps millions upskill in AI, cybersecurity, data science, and more.

Class Central Team Jun 22, 2026

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Envato Tuts+
Rules of Composition
3 ratings

Learn key principles and techniques of visual composition, applicable to design, photography, and art. Gain practical tips and software insights to create harmonious and impactful visual arrangements.
- YouTube
- 33 minutes
- Self-Paced
- Free Video
Dr. D-Flo
How to Convert a Manual Mill to CNC
3 ratings

Learn to convert a manual mill to CNC using ball screws, stepper motors, and LinuxCNC software. Covers mechanical modifications, electronics setup, and software configuration for precise digital control.
- YouTube
- 27 minutes
- Self-Paced
- Free Video
Make With Tech (MakeWithTech)
Getting Started with CAD Modeling for 3D Printing
3 ratings

Learn to create 3D models for printing using CAD software. Explore different design approaches, compare 11 CAD programs, and get recommendations for beginners and advanced users.
- YouTube
- 36 minutes
- Self-Paced
- Free Video
White Hat Cal Poly
Airplane Security - Jennifer Maunder
3 ratings

Explore aviation security challenges, from GPS jamming to in-flight entertainment vulnerabilities. Learn about digital systems, avionics, and ongoing efforts to enhance airplane cybersecurity.
- YouTube
- 28 minutes
- Self-Paced
- Free Video
Paul Marriott - CHANNEL of STUFF
Light Bulb ESP32 Smart Home System with Bluetooth, 5V Relay Module and Arduino IDE - Tutorial
3 ratings

Step-by-step guide to create a Bluetooth-controlled smart light bulb system using ESP32, relay module, and Arduino IDE. Includes hardware assembly, coding, and smartphone setup for home automation.
- YouTube
- 31 minutes
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- Free Video
DroneBot Workshop
Power for Your Electronics Projects - Voltage Regulators and Converters
3 ratings

Explore voltage regulators and converters for powering electronics projects, from classic 7805 to advanced buck-boost converters, ensuring stable power supply for various voltage requirements.
- YouTube
- 37 minutes
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- Free Video
Teaching Tech
Homemade Custom PCB Guide Using Free KiCAD Software
3 ratings

Step-by-step guide to creating a custom PCB for a quiet fan switch circuit using KiCAD software, CNC routing, and 3D printing. Includes circuit simulation, design, fabrication, and testing.
- YouTube
- 21 minutes
- Self-Paced
- Free Video
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ChatGPT for Excel - Increase Your Productivity by 10X with ChatGPT for Excel
3 ratings

Explore how ChatGPT enhances Excel productivity through intelligent suggestions, task automation, and complex calculation assistance, unlocking new possibilities for users of all levels.
- YouTube
- 1 hour
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- Free Video
Justin Brown - Primal Video
VN Video Editor - Updated Tutorial for Beginners
3 ratings

Comprehensive tutorial on using VN Video Editor for beginners, covering project creation, editing techniques, effects, audio adjustments, and exporting on multiple platforms.
- YouTube
- 22 minutes
- Self-Paced
- Free Video
Oracle
Scaling PayPal OLTP Workloads with Oracle Real Application Clusters
3 ratings

Discover how PayPal scales complex OLTP workloads using Oracle Real Application Clusters. Learn about cache fusion, resource management, zero downtime, and scalability optimizations for high-performance database operations.
- YouTube
- 39 minutes
- Self-Paced
- Free Video
Electronics Repair School
Laptop Motherboards Repairs - The Power Input Circuit
3 ratings

Learn essential techniques for diagnosing and repairing laptop motherboard power input circuits, including disassembly, troubleshooting, and voltage checking.
- YouTube
- 47 minutes
- Self-Paced
- Free Video
The Organic Chemistry Tutor
Mental Math Tricks - Addition, Subtraction, Multiplication & Division
3 ratings

Learn quick mental math techniques for basic arithmetic operations, enhancing calculation speed and accuracy without relying on calculators.
- YouTube
- 22 minutes
- Self-Paced
- Free Video
The Royal Institution
What Is Epigenetics? - With Nessa Carey
3 ratings

Explore the fascinating world of epigenetics, its impact on gene expression, and how it shapes our lives beyond DNA. Learn about groundbreaking research and potential applications in medicine and psychology.
- YouTube
- 39 minutes
- Self-Paced
- Free Video
Speed Pharmacology
Pharmacology - Antidepressants - SSRIs, SNRIs, TCAs, MAOIs, Lithium
3 ratings

Comprehensive overview of antidepressant medications, covering mechanisms, types, and specific drugs. Explores monoamine hypothesis, neurotransmitter systems, and various classes of antidepressants including SSRIs, SNRIs, TCAs, MAOIs, and atypical agents.
- YouTube
- 19 minutes
- Self-Paced
- Free Video
Thomas Evans
Fishes I
3 ratings

Explore fish biology and ecology in streams, covering basic features, Maryland fish families, and their ecological significance. Learn about fish adaptations and movement in aquatic environments.
- YouTube
- 32 minutes
- Self-Paced
- Free Video

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