When proceeding to first a runner can not retreat towards home nor can they come to a complete stop of forward motion. If they do either of these the the runner is to be called out without need of a tag on the runner or the base. This only applies to a runner between home and first.
No, the only time a runner is forced to slide or avoid a play is when he has already been determined and called out on the base paths.
A runner can slide into any base.
No they dont if they dont wont to
Yes, a runner may slide into any base at any time.
No, in Major League Baseball a base runner can slide into any base in any direction.
These are terms from baseball. To 'steal' is to advance one or more bases in a situation where the ball has not been hit: where someone has mishandled the ball, or during a pitch. A 'slide' is what players use when as a base runner they approach a base guarded by a defending player who has or is expected to shortly have the ball. If the defending player touches the runner before he touches the base, the runner is out, so the runner slides, usually foot first, toward the base, in an effort to get past the defender before he can be tagged.
Sliding is not required, but it is proven that it helps the batters get to the base faster.