Rating

It's a provisional rating, which means it can increase or decrease by hundreds of points at a time until you've played a certain amount of games.

I am guessing you are referring to today's 10|0 game where you gained 552 rapid rating points - https://www.chess.com/live/game/5427536168?username=haydenv. 

You should have received a message from Chess.com today saying the 10|0 time control is now considered rapid chess, not blitz. The message includes the following statement: 

"As part of this change, rapid ratings will be recalculated for all those who have played a 10|0 game in the past 90 days. If their blitz rating is higher than their current rapid rating, their rapid rating will be set to their current blitz rating. If not, the rapid rating will not be changed."

Before today, your last rapid game was played on April 1, 2017, and your rating was 733 at that time. Your blitz rating at the end of yesterday was 1179 after playing a 10|0 game. So I think the 552 point gain was due to the following adjustments:

(a) Your rapid rating was increased by 446 to make it equal to your higher blitz rating. 

(b) Since you had not played a rapid game for over 3 years, your rapid Glicko RD (rating deviation) was quite high, which accounts for the large remaining 106 point gain from the win. Check out this link if you want to know more about how the Glicko rating system works - https://support.chess.com/article/210-how-do-ratings-work-on-chess-com. 

I am probably not the best person to answer that question. Someone more knowledgeable will hopefully chime in.

My layman’s understanding is the Glicko formula becomes more confident about your rating as you play more games. As the formula gains confidence, the RD (rating deviation) will decrease, which reduces the large rating changes you are currently experiencing. Eventually, your rating will reflect your ranking among the Chess.com population for the given time control. Conversely, if you do not play games for a while, the RD will increase to account for the resulting lack of confidence, subjecting you to large rating swings again. You can see your Glicko RD for a given game type by looking at its full stats page.

The widely used Elo rating system you may be familiar with does not incorporate the concept of RD.

I am not sure how many games it will take for your Glicko rating to settle down, but you should see the volatility of the rating swings gradually decreasing as you play more games. Under the 10|0 time control you seem to be playing, it should not take too long.

Rating is just a number, nothing more, nothing less...

Every real chess player know that rating by ELO is not an accurate decipher for how good a person will be on a given day, it is just an estimation and among this there is only limited information about specific players.

Rating tells the consistency of a player, not where a player's true strengths lie, and that is why I don't like it for the most part. A player could be 1900 but be as strong as a 2300 on his best days, but as weak as a 1500 on his worst days, and among this, this shows the battle of consistency. Chess is a battle of consistency and as long as you are consistenty good you will always blow away the competition, that is how I see it, but regardless this is why I believe "Rating is just a number".

This is coming from a player who is fairly experienced and has been to a good amount of tournaments, rating by ELO is not suffecient enough, Gliko is ok, but in order to know who is the strongest on a given day is impossible to know, so this is one of the reasons we play.