Vallisneria spiralis 'Tiger' from Asia is an excellent plant for beginners, growing in virtually all light and water conditions.
The name 'Tiger' is due to its striped leaves (30-50 cm long, 1-2 cm wide). The relatively short leaves makes it suitable for small aquariums, and the leaves are also narrow, meaning they do not overshadow smaller plants. Forms runners easily, and is thus easy to propagate.