It is the direction your text or image will print on a printer. It may or may not match what you see on the screen. If you want your printout to be taller than it is wide, choose portrait; if you want wider than tall, choose landscape.
portrait
when printing a worksheet you can changes the orientation either on the page layout tab or in print preview? It this yes or no
There is no definitive answer to that as it depends on what way you have your data laid out. Sometimes your actual spreadsheet itself and what way you want to divide it up for printing will determine the best orientation.
landscape
It really depends on what you are printing. You would choose the orientation of the page based upon that.
Long Edge
Paper size Image quality Orientation
Landscape orientation is where the page is turned sideways, so the widest part of the page which is normally the height is now the width, and the normal width of the page is now the height
Wall thickness The orientation The choice of material Design balance
The difference is the orientation of the paper. Landscape is used when you want to print wide items. It would be best to use the print preview feature to see which is better for you.
It will be split by page breaks. Where they appear will depend on various factors, like the size of your spreadsheet, the page layout, what margin sizes you have set, what size paper you are printing to, the orientation of your page and other factors.
Normally we print on pages in Portrait mode, but if you are printing the other way, it is called Landscape. They their names from the usual orientation of paintings of each type.