Vegas Hold'em  

There are  only 5 basic starting hands in the card game Texas hold'em:   connectors, pairs, suited, connected-suited, gapped-offsuits(rags).  All 5 starting hands have specific mathematical quirks which make them profitable in specific situations.

Playing poker is very much like playing the stock market: a price must be paid to see the flop, turn & rivercard
    Bull Market - loose/passive table is where all the action is!!!  We all probably realize that it is best to invest in a bullish market.  The best time to limp in with draws in late position  is in a loose/passive game.   With so many callers,  investing on draws like 78offsuit & A9samesuited will be quite profitable in the long run.
    Bear Market - tight-passive table...not much action or money to be made.  As in the Stock Market,  a bull market can quickly change into a bear market !   An ideal loose-passive table can suddenly change into a tight-passive table as players come&go like the tides. You as a skilled-poker player will have to be prepared & know how to quickly adjust accordingly.   Draws like 78offsuit is unprofitable at this type of "bearish table""...so you'll have to tighten up & be play more aggressively at the same time! Draws like 78 or A8double-suited will not give you the correct price to call!

The price of starting cards - over the long haul, certain starting cards win more $$$ than other starting cards dependant on the Table Texture.
Lets say you're dealt a JT offsuit for example:
    -it's 7 to 1 against flopping a 4 straight draw. So...every time your dealt connectors---there must be at least 6 or more callers limping in to see the flop! That's why it's better to limp in late position for as cheaply as possible & fold to any raises/re-raises! That is why it's wrong to play connectors in early position because: someone right after you might raise; which in turn will make other people fold...ultimately giving you the wrong mathematical odds to make a profitable call!

Let's just assume you're dealt AQ offsuit in early position instead! What do you do?   Well since you have so many outs...this hand is much more profitable&stronger against less players in the pot! Mathematically, it's merely 3 to 1 against you improving...so by betting/re-raising you can limit the field  or maybe even steal the blinds!  If you hold strong holecards-you should make every attempt to win the pot outright...and make other players pay to outdraw you!   Always bet for value;  no need for fancy plays! 
REMEMBER THE 3 BASIC LAWS OF VEGAS HOLD'EM:  table texture & flop texture both dictate correct pot odds to call.
    1)Table Selection - always comes first ! Always invest your time & money in a bullish market.
    2)Starting-Hands -  invest your chips in strong holecards; it's really that simple!
    3)Pot Odds & Position - invest in starting hands only when the price is right - never overpay!   Draws are profitable on a loose table with several limpers.  Pot Odds will  always guide you on  how to play your starting hands profitably.