Your tier is determined on how many ranked stroke play rounds you play, and how well you score in them. Your history shows 5 ranked rounds as a Hack, after the last one you tiered up to Amateur. Each time you tier up, you average is reset, so if in your 1st round as a Amateur, you shoot 45 for 9 holes, your average will go up to 90 ie 2 x 45. After a number of rounds, i think 8-10 as a amateur, your average will only drop with a round below your average, and once it's low enough you will become a Pro, then tour pro etc. etc..
Ultimate goal is Legend, average sub 61.
play well, getting there is only half the game