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Also, is High Sierra still supported?

In keeping with Apple's release cycle, macOS 10.13 High Sierra will no longer be receiving security updates as of November 2020. As a result, we are phasing out software support for all computers running macOS 10.13 High Sierra and will end support on November 30th, 2020.

Beside above, what are high Sierras? The High Sierra is in eastern California, USA, in the Sierra Nevada mountain range. The primary area of interest to the HSHA and its members is the 200-mile (320 km) long Sierra crest from Lake Tahoe to the Golden Trout Wilderness (south of Sequoia National Park). Sierra Nevada means "snowy mountain range" in Spanish.

Also, is Sierra better than Sierra High?

Here's some good news: if your Mac is running Sierra, it can run High Sierra, as the two OS versions have exactly the same system requirements. For reference, these are all the current Mac models that can run both Sierra and High Sierra: MacBook (Late 2009 or later) Mac Pro (2010 or later)

How long will macOS high sierra be supported?

In recent years Apple has continued to provide security updates for the previous 2 versions of OSX/MacOS, so assuming the pattern remains the same you can expect High Sierra to receive security updates from Apple for ~2 years once Mojave is released to the public (i.e. you should be covered until roughly September 2020