Class Central

Rankings
Career Certificates

Subjects

View all

Technology
Business
Creative
STEM
Health & Wellness
People & Society
Personal Growth & Lifestyle

View all Subjects

Universities
The Report

Courses from 1000+ universities

Rankings

Best Courses

Best of All Time
Best of the Year

Most Popular Courses

Most Popular of All Time
Most Popular of the Year

Career Certificates

Generative AI
UX Design
Data Science
Finance
DevOps
Project Management
View all Career Certificates

Technology

Computer Science
Artificial Intelligence
Data Science
Web Development
Programming
Databases
IT & Networking
DevOps
UX/UI Design
Blockchain & Cryptocurrency
Extended Reality (XR)
Generative AI
Cloud Computing
Cybersecurity
Game Development
Product Management
View all Technology

Business

Management & Leadership
Finance
Entrepreneurship
Marketing
Strategic Management
Project Management
Sales
Business Software
Real Estate
Professional Development
Accounting
Supply Chain Management
Business Strategy
Human Resources
View all Business

Creative

Music
Digital Media
Visual Arts
Design
Crafts
Performing Arts
AI Art
View all Creative

STEM

Mathematics
Engineering
Science
Statistics & Probability
Chemistry
Physics
Environmental Science
Astronomy
Biology
Agriculture
View all STEM

Health & Wellness

Disease & Disorders
Public Health
Health Care
Nursing
Mental Health
Continuing Medical Education (CME)
Medicine
Wellness
Nutrition
View all Health & Wellness

People & Society

Humanities
Education & Teaching
Social Sciences
History
Literature
Sociology
Economics
Psychology
Anthropology
Political Science
Law
Language Learning
Writing
Philosophy
Religion
View all People & Society

Personal Growth & Lifestyle

Personal Development
Sports & Recreation
Personal Finance
Parenting & Family
Food & Drink
Self-Defense & Martial Arts
Gardening
Productivity & Time Management
Games
Study Skills
Travel
Pets & Pet Care
Beauty & Makeup
Home & Living
Critical Thinking
View all Personal Growth & Lifestyle

Chasing 100M Daily Users, Duolingo Reconsiders Ads, Paying Influencers, and Its Most Expensive Plan

AI got cheap enough that Duolingo’s most expensive plan may not survive it. I read the earnings call transcript and opened the app to see what is actually changing for learners.

Dhawal Shah Sep 03, 2026

Latest

[2026] 17% of Coursera Courses Have Peer Reviews: Here Are the Best
7 Best Online First Aid Courses and Sites for 2026: CPR, AED, and Emergency Response
7 Best Node.js Courses in 2026: Build APIs in JavaScript
12 Best Data Analysis Courses for 2026: From Data to Insights
Coursera’s Hidden Free-Access Courses (and What’s Actually Free About Them)

Write for The Report

Visit The Report

600 Free Google Certifications
Trending

Most common

Popular subjects

Artificial Intelligence
17,507 courses
Data Science
11,440 courses
Cybersecurity
14,270 courses

Popular courses

L'Italiano nel mondo
University of Naples Federico II
Introduction to HTML5
University of Michigan
Umano Digitale
University of Urbino

Organize and share your learning with Class Central Lists.

View our Lists Showcase

Sign up

Log in or Sign up

Log in
Sign up

Free Online

Phd Courses

Explore a wide range of free and certified Phd online courses. Find the best Phd training programs and enhance your skills today!

51 courses

Related Subjects

Technology Courses
Health & Wellness Courses
Personal Growth & Lifestyle Courses
STEM Courses
Business Courses

Showing 51 courses

Sort by Relevancy

Filter by

Filters

1. Free course (50)
2. With certificate (12)
3. From universities (12)
Level
1. Beginner (5)
2. Intermediate (8)
3. Advanced (38)
Duration
1. < 30 mins (1)
2. 30 - 60 mins (9)
3. 2 - 5 hours (1)
4. 5 - 10 hours (1)
Subject
1. Technology (34)
2. Health & Wellness (11)
3. Personal Growth & Lifestyle (3)
4. Business (1)
5. STEM (1)
Language
1. English (23)
2. Chinese (28)

Open Data Science
Artificial Intelligence Safety and Security - Roman V. Yampolskiy, PhD
2 ratings

Explores how advanced AI could create new safety and security risks, from deepfakes and cyberattacks to uncontrolled superintelligence.
- YouTube
- 40 minutes
- Self-Paced
- Free Video
Applying to study for a PhD in psychology
7 ratings at OpenLearn

This free OpenLearn course is for psychology students and graduates who are interested in PhD study at some future point. Even if you have met PhD students and heard about their projects, it is ...
- OpenLearn
- 6 hours
- Self-Paced
- Free Certificate
NPTEL-NOC IITM
Scientific Writing: PhD Thesis - Acknowledgements, Bibliography, and Text Stylistics
1 rating

Master the art of PhD thesis writing, focusing on acknowledgements, bibliography, and effective text stylistics for scientific papers.
- YouTube
- 30 minutes
- Self-Paced
- Free Video
Australian National University
How to Survive Your PhD

Learn evidence-based strategies for emotional resilience and supervision that will help you finish your PhD or research degree.
- edX
- 4 weeks, 2 hours a week
- Self-Paced
- Free Certificate
AI TIME PHD - AAAI 专场二


AI TIME PHD 的 AAAI 专场第二期，聚焦人工智能领域的学术交流。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PHD - AAAI 专场四


AI TIME PHD 系列第四场 AAAI 专题课程，聚焦人工智能领域。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PhD 浙江大学CAD&CG国家重点实验室专场一


AI TIME PhD 浙江大学CAD&CG国家重点实验室专场一
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PhD 浙江大学CAD&CG国家重点实验室专场二


AI TIME PhD 浙江大学CAD&CG国家重点实验室专场二
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PhD ICLR专场五


AI TIME 的 ICLR 博士生专场第五期，聚焦人工智能研究交流。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PHD AAAI专场七


AI TIME PHD系列AAAI专场第七期。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PhD 哈工大HIT-SCIR实验室专场二


哈工大HIT-SCIR实验室博士生专场，分享人工智能研究主题。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PHD AAAI专场六


AI TIME PHD 的 AAAI 专场第六期，课程文本未提供具体议题。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PhD ICLR专场七


AI TIME 博士系列的 ICLR 第七场人工智能专题活动。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PhD 哈工大HIT-SCIR实验室专场一


聚焦哈工大HIT-SCIR实验室的人工智能博士专题专场。
- XuetangX
- Self-Paced
- Free Online Course
AI TIME PHD AAAI专场八


AI TIME博士系列围绕人工智能主题的AAAI专场第八期。
- XuetangX
- Self-Paced
- Free Online Course

Career Certificates

Generative AI
UX Design
Data Science
Finance
DevOps
Project Management
All Subjects

Coursera
Udemy
Noble Desktop
Simplilearn
CodeSignal
Boot.dev
All Universities

The Report by Class Central RSS Feed

Series Finale of Online Education
Udemy Earns More, Pays Less
Duolingo's 2026 Strategy
1000s of Free Certificates
Best Courses Guides
Best of All Time
Most Popular of All Time

About Class Central

Class Central aggregates courses from many providers to help you find the best courses on almost any subject, wherever they exist.

Facebook
Twitter
LinkedIn
YouTube
Bluesky

Class Central © 2011-2026 Privacy Policy

About Us
Join Us
Write for Us
Help Center
Contact Us

Share

Facebook
Twitter
Bluesky
Email

Never Stop Learning.

Get personalized course recommendations, track subjects and courses with reminders, and more.

Sign up for free

Someone learning on their laptop while sitting on the floor.