Archive:Kdenlive/Manual/Transitions
Transitions
Transitions govern how Kdenlive cuts from one clip to the next. You can add many different transition effects using Kdenlive's transitions.
To add a transition adjust clips in the time line so that the end of one overlaps with the begining of of another.
And then right click in the time line at the overlap point, select and then choose one of the transitions from the flyout.
see Kdenlive/Manual/QuickStart#transition
FAQ:
Q: How to add a cross fading effect
A: Make clips on two tracks overlap in time, then pull the green dot popping-up in the corner of the bottom clip (see Kdenlive/Manual/QuickStart#transition )