I came from this link, and quote
It is highly encouraged to use Solidity v0.7.0 or newer. If you want to use a version of the 0.6 series, please make sure to not make use of flaws that have been fixed in 0.7. Don't use versions older than 0.6
And looks like solc fixes a lot of security bugs in each release, and I want to figure out what security issue was fixed at compiler level.
I found this release notes page, and I tried to open a few of them but there's nothing about security.
How can I get a the list of security enhancement in each release?