#1 - Learn the 2 to make 3, 2 letter words
I posted these with definitions on Joyce’s Scrabble Mania

#2 - Go for the hot spots (color squares) with big tiles like Q, X, J, K

#3 - Learn the 3 letter words

#4 - Get the Official Scrabble Dictionary 3 - if any word is not found in at
least 2 of the 5 American Dictionaries it will NOT be in the OSD3

#5 - Learn the Q without U words, there are 12 in all

FAQIR, FAQIRS - a Hindu ascetic (more commonly spelled fakir)
QAID, QAIDS - a Muslim leader
QANAT, QANATS - a system of underground tunnels and wells in the Middle East
QAT, QATS - an evergreen shrub
QINDAR, QINDARS - a monetary unit of Albania
QINDARKA - a variant of QINDAR
QINTAR, QINTARS - a variant of QINDAR
QOPH, QOPHS - a Hebrew letter
QWERTY, QWERTYS - a standard typewriter keyboard
SHEQEL - an ancient unit of weight and money
SHEQALIM - plural of SHEQEL (so no SHEQELS!)
TRANQ, TRANQS - a drug that tranquilizes

#6 - Learn to watch your leave (what is left on rack after a play)
Play off multiple tiles especially vowels if at least 10-20 points, if no good play exchange
My rack looks like this AAIIOTT
I would look for a way to play off ait or at least ai, but if no good play,
I would exchange all but at, chances are with this kind of leave-watching
you will soon have a bingo

# 7 - Learn the bingo stems! I have posted the Top 10 Bingo Stems wordlists
used by the NSA plus 17 more bingo stems wordlists on  
Joyce’s Scrabble Mania

Example: #1 satine A: entasia

#8 - Rearrange tiles often, words will appear, in Scrabble® CD click Shuffle
every few seconds, shuffle, shuffle

#9 - Never waste Blank or S! they are your 2 best friends in Scrabble
most often you need 1 or both to bingo for big points

#10 - Defensive play can be good but be careful not to block yourself as well.
If you have a bingo but no place, or close to bingo and no place, try to make yourself a spot for next play without being conspicuous about it.