• 技術ぎじゅつ — technology / skill
• 技師ぎし — engineer / technician
• 技能ぎのう — technical skill / proficiency
• 演技えんぎ — performance / acting
• 技わざ — technique / move（esp. sports / martial arts）
• 技量ぎりょう — skill level / capacity
• 技巧ぎこう — craftsmanship / technique
• 競技きょうぎ — competition / match

Left radical 扌 means “hand,” signaling manual action or skill. The right part 支 cues the on-yomi ギ. The character broadened from a hand’s action/control to “technique” and “ability.”

In martial arts, わざ labels a specific move; in professional contexts it points to technical mastery or know-how.

彼かれの 技わざは 本物ほんものです。
His technique is the real deal.

技術ぎじゅつの 進歩しんぽが 社会しゃかいを 変かえる。
Technological progress changes society.