These are not package tours but routes that work on a student budget. They are built the same way: cities within night-bus or cheap-train distance of one another, accommodation costed at hostel and student-residence prices, and day plans tight enough not to lose a day to a museum queue.
Each route page lists transport options and approximate journey times between cities, where to look for accommodation, a suggested daily plan and a budget range. Prices move with the season — check the date on the page and confirm fares against your own travel dates.
For preparation before you travel see the country guides, and for process articles the guides section.