手 is a picture of a hand — the lines were once five fingers and a wrist, fanned out. When it appears on the left of other characters it squishes into 扌 (the 'hand radical'), which you met in 找 (to look for) — and it marks hundreds of doing-words.
手 is the hand, and it's everywhere in daily words — most of all 手机 (shǒujī, 'hand-machine') = mobile phone, the object glued to every modern Chinese hand. 手 also means a skilled person: 高手 (a master/expert, 'high hand', with 高), 新手 (a beginner/newbie, 'new hand', with 新), 选手 (a contestant). 左手/右手 are left/right hand. From the body part grew a whole vocabulary of skill — your 'hand' at something is how good you are.
Five fingers and a wrist — a HAND.
手机 ('hand-machine') is the mobile phone. 手 also rates skill: 高手 (a master, 'high hand'), 新手 (a newbie, 'new hand'). Your 'hand' is how good you are.