Why was the land so important in the lives of medieval people? What were the ways of cultivating the land?

Why was the land so important in the lives of medieval people? What were the ways of cultivating the land? What tools did you use? What is crop rotation and what is its significance?

Crop rotation is a scientific substantiation of crops in time and territory (Easier, this is the turnover of annual crops) This technique is needed to avoid depletion of the soil and obtain a rich harvest on the same beds from year to year.
The land was so important in the life of middle-aged people, because often landowners did not work at work, where they would be given coins, but worked for themselves and in their own garden and could only feed themselves with products from the garden. There were ways of cultivating the land: hoe-fire, slash-and-fire and plow (two-field). In the first two, the principle was similar, at the selected site, tree stumps were cut down and then burned out for further processing with a hoe or undercut, two-field is a method similar to the one described above, it implies the use of different sites on the same territory in different years.