Though free, the below websites/materials are very useful for gaining knowledge related to recent technical developments, try these for free,

1. https://cognitiveclass.ai

2. https://developer.ibm.com

3. https://www.ibm.com/blogs/blockchain/2017/08/blockchain-in-academia-training-for-students-and-educators/

4. Machine Learning - Stanford University by Andrew Ng (One of the best)

5. Edx - Introduction to AI - Azure by Microsoft

.