Installed git 2.19.2.1 on manjaro linux - connecting with or without SSH-Keyset

good day dear ARM-Experts

just installed git 2.19.2.1 on manjaro linux

note - i also have installed Atom - the hackable editor of the 21th Century..

Pakete (1) git-2.19.2-1

Gesamtgröße der installierten Pakete:  34,81 MiB
Größendifferenz der Aktualisierung:   0,00 MiB

:: Installation fortsetzen? [J/n] j
(1/1) Prüfe Schlüssel im Schlüsselring                                [#######################################] 100%
(1/1) Überprüfe Paket-Integrität                                      [#######################################] 100%
(1/1) Lade Paket-Dateien                                              [#######################################] 100%
(1/1) Prüfe auf Dateikonflikte                                        [#######################################] 100%
(1/1) Überprüfe verfügbaren Festplattenspeicher                       [#######################################] 100%
:: Verarbeite Paketänderungen...
(1/1) Installiere git                                                 [#######################################] 100%
:: Starte post-transaction hooks...
(1/3) Reloading system manager configuration...
(2/3) Creating system user accounts...
(3/3) Arming ConditionNeedsUpdate...

now i have serveral options - i can connecting  atom/ on linux with GIT and github,

See here; heard that this would be but very simple from the command line and linux...
Set your email: https://help.github.com/articles/setting-your-commit-email-address-in-git/
After uploading keys, test your ssh connection: https://help.github.com/articles/testing-your-ssh-connection/
Switch repo to use ssh rather than https: https://help.github.com/articles/changing-a-remote-s-url/#switching-remote-urls-from-https-to-ssh

but if i look at my atom editor i have the options of

- connect with GIT
- connect with GITHub

well whats the difference here betweeen git and github!? why cannot add some commmits while i see the git with create detached commend - nothing happens here?