A note about license versions
If you are more or less familiar with the CC licenses, you have probably seen already that sometimes a number appears right after the terms of the license, for example, “CC BY-SA 4.0”. That number is the version of the license that the person is using.
When the CC Licenses were launched, there was a significant amount of work put into making them “portable”. This meant that the licenses were not only translated into a different language, but also they were made to work within each national jurisdiction that the license was being “ported” to. One of the significant changes (among others) brought by version 4.0 was that licenses are no longer “ported”. This is because the licenses are now internationalized, and they don’t require anymore to be ported. They are only translated.
However, an important thing to note is that sometimes the different license versions have different requirements when it comes to attribution, and is normally a good idea to try to use the latest versions (particularly version 3.0 and 4.0). Unfortunately, there are some bad actors as described in this article: “Automated image recognition: How using 'free' photos on the internet can lead to lawsuits and fines” that have abused the attribution requirements using the different versions. If you are curious to understand more about what changed from version to version, you can always check this chart made by Creative Commons.
In short, use the latest versions whenever possible, and never forget to follow the TASTASLL approach when attributing a work.