Many leading publishers and vendors are making their training / learning materials free of cose during the COVID-19 lockdown period so that people can sit and learn.

I have found ACM Digital Library[1] and RedHat[2] to be made free for now.

Can you all please point out to some valuable learning stuff which is free now but would be payable once lockdown is lifted?

Gotta make hay while the sun shines brightly on us :)

Reference:

[1]https://news.ycombinator.com/item?id=22762508

[2]https://www.redhat.com/pt-br/campaign/red-hat-free-courses