In version 3.5 and 4.4 are no information what it means "LTS"
In my opinion there should be some short information in chapter Introduction:
"it is a LTS version (long term support). This version is supported by bugfixes from Juni 2017 till June 2020 and by a extended support till June 2021 (only security fixes)".
A link to the release plan page is also helpful to understand the LTS releases: https://contao.org/de/release-plan.html
In version 3.5 and 4.4 are no information what it means "LTS"
In my opinion there should be some short information in chapter Introduction: "it is a LTS version (long term support). This version is supported by bugfixes from Juni 2017 till June 2020 and by a extended support till June 2021 (only security fixes)". A link to the release plan page is also helpful to understand the LTS releases: https://contao.org/de/release-plan.html