Every column shows a different type of data from your Account:
A - Ticket: This refers to your Trade ID.
B - Order Type: Market Execution Trades will show as Buy, Sell or Balance. Pending Orders will read Buy Limit, Sell Limit, Buy Stop or Sell Stop.
C - Symbol: This will show the symbol of the instruments of your trade. Example: BTCUSD.
D - Volume: This refers to the Volume of your trade.
E - S/L: The Stop Loss set will appear here.
F - T/P: Any Take Profit that was set will show here.
G - Opened At: This will show the date and time the trade was opened.
H - Open Price: This will show the price of the trade it was opened.
I - Closed At: This will show the date and time the trade was closed.
J - Close Price: This will show the price of the trade was closed.
K - Swaps: If you had any swap fees, they will appear here.
L - Commission: Commission fees will appear here.
M - Profit/Balance: Any profit or loss of the specific trade will appear here. Losses are marked in red.
N - Comment: This will show any additional comments or notes generated by either the user's EA or by the MetaTrader itself along with any personal notes you may have edited.