Watch the anime Naruto or read some of the manga series to see the types of hand seals used in the series to perform jutsus. There are 12 main hand seals used in most jutsus performed in Naruto, each one based on one of the 12 animals in the Chinese zodiac. While the jutsus in the anime often move very quickly, it can help your learning process to see how the jutsus are performed in the series and how the hand signs are used.
Find a guide online that illustrates each hand seal separately. Websites such as Leaf Ninja and Naruto-kun provide images of Naruto hand seals, as well as the names of the hand seals and the animals they symbolize. These images often show the way the hands are positioned in each seal.
Memorize each seal separately, and use your hands to mimic each seal as you memorize its name and associated symbolism. Some of the seals have not only animal associations, but directional and seasonal associations as well. Learning these associations can help you with accurate hand positioning, as some seals mimic the symbols they are based upon.
Test yourself as you go through the 12 seals, and challenge yourself to bring each hand seal and its name to mind independently, without looking at the guides.
Move quickly from one hand seal to another to work on both speed and accuracy in performing the hand seals after you have learned how to make each seal separately.
Make your own jutsus by putting hand seals together in different combinations. This can help you learn how to make the hand seals quickly, rather than thinking about each seal slowly and separately, and may help you learn faster because of it.