These are the essential tools which make a poker  game work. When the game first starts everyone 
draws one card and highest draw has a 'dealer' button placed in front of him. In casinos the dealer 
will do this at the start of every game. 

The dealer deals the cards one at a time to each player clockwise ALWAYS. The first to receive a card (the player to the left of the dealer button) is called "the Small Blind" and becomes the first to 'act'. The second to act (two to the left of the dealer) is called the Big Blind. After these two we have 'first position', 'second position', all the way to the last position (the 'button') which would be the player sitting with the dealer button in front of him.

The small blind and the big blind HAVE to put up money to receive their cards hence the name Blind. Everyone else receive their cards for free and then choose if they would like to wager of fold. The amount of the big blind is a full minimum bet and the small blind is half of the minimum bet. So if you are the small blind and want to play you must either wager the other half of your forced
bet or fold and lose you half-bet.

After each hand has been dealt, all the bet sessions have finished, and the winner has been established, the dealer button is moved one position clockwise. The 'actual' dealer of the table then deals the first card to left of whoever the player is with the dealer button in frony of them. This way everyone plays every position as the game moves on. If there were no blinds at all then everyone would just wait for the best possible hand and all skill would be eliminated, so you see that the blinds are very key elements of poker.

Sometimes in certain forms of Poker, home games, or during the later stages of a tournament, 'antes' are put into play. These are small forced bets (around 1/4 of the min bet) for ALL players in ALL positions of the game. In this case no hands from any position are free and the blinds have to put up their forced bet plus the ante.

When it is your 'turn' in poker your can either bet nothing or say 'check', match someone else's bet by 'calling', 'raise' someone else's bet, or fold your hand. When and why it is your turn will depend on your seat which will be discussed below.

In a 2-4 game the minimum bet would be $2 and maximum would be $4. So if you want to play your hand you can come in or 'call' with $2. If you really like your hand you can come in with a 'raise' for $4. If the person who is next to 'act' after you wants to 're-raise' you he can come in for $6 even though the max bet is $4 because it only counts as re-raising you by $2. Now if more than two people are in the hand there are 3 raises allowed so someone could actually bet $8 at once in a 2-4 game. So a BET SESSION is when all the players have finished betting, raising, and folding in an orderly clockwise manner. A typical bet session in a seven player 2-4 game would be :

Fold, Fold, Fold, Call, Call, Raise, Fold, Call, Call. (9 actions)
What happened here?

The first three players folded, players 4 and 5 came in with $2 each, player 6 raised them $2 therefore coming in for $4, player 7 folded, then players 4 and five called the other $2 they owed if they wanted to play because player 6 raised them. So you see a bet session must go in order, that's why there are 9 actions here but only seven players.
The quick poker terms of stating what happened would be:
Seats 4 and 5 called seat 6's raise.

2. Usually if you ever see someone with Four Aces lose it's in the movies or on a T. V. show but I have actually seen it happen. A “STRAIGHT FLUSH” in your hand means just what it says, a ‘straight’ plus a ‘flush’. All five cards in your hand are in consecutive order AND they all have the same suit.

Yes ! This does mean that you CAN actually LOSE with a royal flush to another royal flush, but the chances of that are lower than guessing how many grains of sand there are in a sand box!