Please explain the last 2 lines

Faults. A vertical fault outcrops as a straight line and inclined faults show changes in direction across the area. The dip of a fault plane can be estimated in the same way as the dip of bedding planes.Dip faults cause lateral displacement of beds (Fig. 7.35), while strike faults Cause elimination or repetition of strat (Fig. 7.36 and 7.37). The up-throw and down-throw sides ofa fault can be identified on maps by applying the rule that younger beds are found on the down-throw side and older beds on the up-throw side.