Introduction

HDMI DVI Resolution Power SDcard test Login Keyboard, Time, setting Which board to buy eMMC RAMLOG filled up (did u & Igor) improve there?
HDMI DVI Resolution Power SDcard test Login Keyboard, Time, setting Which board to buy eMMC RAMLOG filled up (did u & Igor) improve there?
HDMI DVI Resolution Power SDcard test Login Keyboard, Time, setting Which board to buy eMMC RAMLOG filled up (did u & Igor) improve there?

After download

If you have Linux, look for the MD5 hash. what have we in the documentation to link to
what have we in the documentation to link to
What should happen on the first boot. what have we in the documentation to link to

General questions

Mostly in package versions and their maturity. Debian Stretch is matured, while Bionic needs to become. Most applications will just work on both out of the box while some applications would like to have a Debian package base, others Ubuntu. It's up on your special use case.
These SBC (single board computer) often come with an ARM processor just like your mobile phone and with a Micro-USB port to power it. Whereas your phone also has a battery in contrary to your SBC! You maybe also ran into the situation were you wanted to start your phone with an empty battery - connected the charger - the phone started and switched off again. What happend? Your Wall-Charger did not deliver enough juice to power the energy-hungry boot process. So you see the importance of a cable with thick copper lines and a best in class power supply. We have a whole section in the forum about it https://forum.armbian.com/forum/31-sd-card-and-power-supply/
SDcard test Login Keyboard, Time, setting eMMC RAMLOG filled up (did u & Igor) improve there?