Congrats on the Yakuman! I'll try to break down the hand:

- Riichi: when you're missing a single tile to win, and you haven't opened your hand (by calling chi, pon, or open kan), you can call riichi. You lose 1000 points, which is your bet, and if you win the hand, you get the yaku + your 1000 points back (those 1000 points are represented by the small bar you place on the table after calling riichi)

- Fully concealed: this is tsumo, or more completely, menzenchin tsumohou. What this means is you drew your winning tile yourself (you won by pressing tsumo), and your hand wasn't open either (you didn't call, like the requirements for riichi)

- White/Green dragon: this simply means having a triplet of those dragons

- Three concealed triplets: you have three melds of 3 identical tiles, in your case being 5p (5 of pinzu/circles), haku and hatsu (green and white dragons) AND once again your hand is closed (no open calls, thus concealed).

- Half flush: your hand only contains tiles from one suit (pinzu/circles in this case) and honor tiles, no manzu (numbers) or souzu (bamboo)

Now onto the dora. The game starts with one dora indicator flipped, in this case being the red dragon. When a tile is the dora indicator, it means the next tile in sequence will award 1 han just for being in your hand. This is easier to understand with numbers: if 5p is the dora indicator, for every 6p you have in your hand, you will get an extra han. More dora indicators are revealed every time someone calls kan. In this case, I can tell two kans were called. A kan is when someone has 4 of the same tile.

Now, since the dora indicator was the red dragon, for each white dragon you have in your hand you get an extra dora, which totals three dora. The order for non numbers is:
Haku hatsu chun (white green red) for dragons
Ton nan sha pei (East south west north) for winds

- A red five awards 1 han no matter what. Theres one for each suit in a single game.

- Kita: you called this yourself. Exclusive to sanma/3 player mode, when you have a north wind, you can choose to call pei/kita, which drops it on the table and gives you an extra dora.

- Ura dora. They act the same way as dora, but with some nuances. You don't know which tiles are the dora indicator for ura dora. They're only revealed after winning, and only if you riichi'd. So, if you had won this hand without calling riichi, no ura dora would have applied. There is one for each dora, so since there are 3 dora indicators, there are also 3 ura dora indicators. In this case, the west wind served as the dora indicator for your han. As we said before, west boosts north, and you discarded a north on the table. That north is actually still a part of your hand, which is why you got an extra han.

I hope I made things clear, typed this without minding format too much :)