The goal in jury selection is to strike bad jurors.
A lot of people use jury selection to try to get a jury in their favor. The problem with this is jury selection is setup to get rid of bad jurors, since you can only strike jurors. Even if you strike enough jurors to get a juror you like opposing counsel will have the opportunity to strike that juror. If opposing counsel is low on strikes you may be able to us your strikes to get 1 or two favorable jurors on the jury, but that is generally the exception not the norm.
There are a number of ways attorneys try to get a favorable jury that usually are not successful. Sometimes attempt to try their case in jury selection. This is against the rules of evidence, and some attorneys consider it unethical. Also the judge and jury will pickup on what you are doing and you could lose your credibility with them in the case.
Another popular trick attorneys try to use is to educate them about the law and issues in a way that favors them (without trying the case). The problem with this tactic is jurors are unlikely to change their minds after being questioned about an issue for 5 minutes.
