I found a new but good plaform to learn blockchain development course at https://braingrowacademy.com. I reviewed this platform and found fee courses and good things is all are free. Also i completed two courses and received my certificate instantly.
But few courses are there, may be in my location only these courses are available.
You must to check this platform if you want to learn.
Below is a link of my certificate, you may check and can get for yourself.
https://www.braingrowacademy.com/certificates/e190348b-7dfd-4df7-ae6b-9cf81a7eecfa
Happy learning.