There are many perspective videos on this site. This video is a fairly brief treatment of 1, 2, and 3 point perspective in overview. More detailed treatments, such as, cylindrical and spherical perspective can be found in the Perspective Category.
Author: Tony O'Regan
Perspective Sketch to Paint Venice Waters Edge 1 of 3 {Mar 2017}
Perspective Sketch to Paint Venice Waters Edge 2 of 3 {Mar 2017}
Perspective Sketch to Paint Venice Waters Edge 3 of 3 {Mar 2017}
Perspective Grids
You can purchase or make grids of various kinds and use them as underlays for your perspective drawing. They break down into ‘exterior grids’ for FORMS and ‘interior grids’ for SPACES. You can google images of these to get the idea of the variety. I have used these quite a lot and they are one of the 4 major ways of doing ‘measured’ perspectives, perhaps the quickest for many projects:
1 – computer (try Sketchup),
2 – photoperspective (see the many vids on this on this site – use the Search Box),
2 – Plan Projection (also use the search Box);
3 – Underlay Grids. I plan more videos on this in future.