A basic lesson in METAR
The first two are basic information. KGKY is the airport (in this case, Arlington Regional) and 191853Z is the date and time it was issued. The first two digits are the day of the month (19 for, well, the 19th), the last four plus Z is the time *in UTC*. So, 18:53 UTC, KGKY is in CDT (UTC-5:00), so it was issued at 13:53 CDT.
A basic lesson in METAR
Next, we get visibility and cloud coverage. Visibility is given in statute miles (the SM), so, right now, visibility is 10+ statute miles. (Note that it only ever reads up to 10. So, 10 is implied 10 or more.) Then we get cloud coverage. Here, there are two cloud layers. The letters indicate how much of the sky is covered, the numbers at what altitude (in *hundreds* of feet). So, we have scattered clouds at 2200 and 3300 feet.
A basic lesson in METAR
The cloud coverage is given by a phrase that represents some number of eighths of the sky covered. SCT (scattered) is 3-4 oktas (1/8ths of the sky). Other phrases:
CLR (clear): no clouds
FEW (few clouds): 1-2 oktas
BKN (broken): 5-7 oktas
OVC (overcast): 8 oktas
CLR could also be replaced with SKC (sky clear), NCD (no clouds detected), or NSC (no significant clouds) depending on where you are and how the report was generated.
A basic lesson in METAR
RMK denotes the start of the remarks section. I'm not going to go too in-depth here, but I'll cover some basics of what we've got. AO2 denotes that this was done by an automated station with precipitation discriminator. PK WND is peak winds. SLP is sea level pressure (in kPa, iirc, so 118 kPA or ~34 inHg). And T is the temperature to the tenths place in °C (26.1°C, dew point of 19.4°C. If it's below zero, the 0 at the front becomes a one (M09 -> 109X).
A basic lesson in METAR
So, there you go. Now you're capable of reading METAR! Now, why not go try it yourself? You can find METAR data for any US airport at https://aviationweather.gov/metar. Why not try finding an airport near you (assuming you're in the US) and seeing what it's reporting the weather as?
A basic lesson in METAR
ofc, there's always more to learn. For instance, you might have TSVC (thunderstorms in the vicinity) or +RA (heavy rain) or FZFG (freezing fog). If you're interested and want to know more, I'd encourage checking the Wikipedia article, as it goes into various other bits you can have in METAR strings, including WX codes like the ones I just gave and various bits that might come after RMK in the US.
A basic lesson in METAR
The next chunk is wind information. The first three digits give the wind direction in degrees from north. So, 170 would be 170° off north or just off south (southeast by south). The rest is the speed in knots (hence the KT at the end). In this case, we have a wind gust. The digits before the G are the normal wind speeds (19 knots), the digits after are gust speeds (gusting up to 29 knots).