It is true that it has many varieties and uses different techniques and materials (paint, paper).
While the 'hot' offset where the printed paper web passes through the drying tunnel. The classic offset (water) is associated with the use of water rollers and hydrophilic and hydrophobic surfaces, however, this method is already abandoned due to the difficulty in obtaining a good balance of water and oil paint. The successor of this method is anhydrous offset printing where silicone molds are used instead of water.
Professionals usually use one or two proven programs, which translates into their high productivity. In the work of graphics or DTP operator you usually need a program for processing vector and raster graphics.
You can also include word processors, programs provided by print equipment manufacturers, to the pool of programs needed for such work.
However, the price you have to pay for the possibility of online orders can be deterred by smaller printing houses and printing plants from such an investment. .