Which session to select from drop-down list of log in screen

[ubtnk]

In the log in screen, there is a drop-down list containing sessions of Lubuntu, LXQt Desktop and Openbox.
Now I am using Lubuntu 18.10 Desktop 32 bit.
Which session should I select from such drop-down list?

[Frogs Hair]

Start with Lubuntu or LXQT , If you are new. You can do some research on open box and decide later if you want to use it.

[ubtnk]

Can you please explain more about those 3 sessions in brief for me?
I am using Compaq Presario notebook V3000, it's over 11 years old and has only 2Gb RAM.
I'm afraid that setting or changing may affect Lubuntu on my aged notebook.

[Frogs Hair]

Lubuntu 18.10 uses the LXQT tool kit. Lubuntu is the full session LXQT would be a more minimal session and and there is also openbox.