“skill / technique” in Japanese is 技, read gi, waza (ぎ, わざ). It is a Grade 5 Kyōiku kanji, taught in year 5 of Japanese elementary school, and appears in words such as 技術 (technology).
What does 技 mean?
すごい技を見せる。
Same sound, different character — the classic trap. Compare them side by side: