thank you,
and what is the difference between elo and glicko-1?
To add to what Finch posted, I'd say Glicko is a better estimate of real player skill than Elo is, and it is the rating that GXE takes into account as part of its calculation formula (though I'm sure there are lots of other factors, as the two don't map onto each other 1:1). As for what each rating means:
When you create a new alt, you have a Glicko rating of 1500±300, and GXE aims to estimate the likelihood of a player winning versus someone with said rating—i.e. a completely random opponent. Glicko can increase or decrease from there, though I'm not sure if there is a cap/floor on what PS! will allow a Glicko rating to rise/fall to. As you play more games, your Glicko deviation will decrease, and a GXE value is generated only when the deviation drops below ±100. If you don't play in a while, the deviation on your Glicko rating will increase and, as such, it will become less representative of your real skill level.
As for Elo, you start at the lowest possible rating (1000) and you gain or lose points each time you win/lose/draw. If you go a while without playing any games, your Elo will decay at what I assume is a logarithmic (infinitely slowing) rate. It is very good for tracking short-term achievement, making it good for things like OLT and for the primary purpose of PS!'s ladder, and rewards activity more than consistency, though you obviously still need both, especially once you get very near the top of the ladder (most games will result in either a small increase when winning or a large drop for a loss/draw).
To put into perspective why I don't think Elo a very good measure of skill, I was looking through the ladder a few weeks ago and saw an alt in the top 500 (with an Elo rating of over 1750) that had more losses than wins, over 4000 ladder games played, a GXE of 59.9%, and a Glicko rating of less than 1600 (which doesn't even get taken into account in tiering statistics), so you can (and will) climb just by playing a lot even if you don't perform particularly well and your Elo rating will reflect your recent games more than your overall record. Either way though, all of these rating systems are sorta fake and frequently get manipulated by people who just dump bad alts, so I wouldn't worry too much about it. Tournament placements and success in friendlies should take precedent over rank, as with any game, and a lot of top players (ABR included) seldom use the ladder outside of tournaments like OLT.
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