Diff between Buy Stop and Buy Limit??

 
After you stop laughing at how new I am. please share with me what the difference is between a pending buy stop and a pending buy limit

OP_BUY 0 Buying position.
OP_SELL 1 Selling position.
OP_BUYLIMIT ???
2 Buy limit pending position.
OP_SELLLIMIT ???
3 Sell limit pending position.
OP_BUYSTOP ???
4 Buy stop pending position.
OP_SELLSTOP ???
5 Sell stop pending position.

What are buy limit pending? and buy stop pending? what is the difference between these?
 
STOP orders are trend orders. LIMIT orders are contr-trend orders.
BUYSTOP and SELLLIMIT shoud be placed above the market.
SELLSTOP and BUYLIMIT shoud be placed below the market.
 
See picture
Reason: