Spindleruv Mlyn
The country's biggest area with its deepest bench of ski schools and the most room to progress beyond your first week.
Spindleruv Mlyn is the clear number one. It is the largest ski area in Czechia, set in the Giant Mountains, and crucially it has the most ski school capacity in the country, so booking proper lessons with an English speaking instructor is straightforward even in a busy holiday week. The nursery areas are generous, and once you find your feet there is more easy terrain across its two sectors to graduate onto than anywhere else in the country.
It takes top spot because it pairs the best teaching with the most progression terrain and a real resort town full of places to rest and eat. It is the busiest Czech resort in peak weeks, and the linked sectors take a little learning to navigate, but for a beginner who wants room to improve, it is comfortably the most capable base.