投tóu

to throw, cast. 7 strokes, radical 扌, first met in HSK 4.

Pinyin tóuStrokes 7Radical 扌Band HSK 4Words 5

What 投 is made of

扌 (shǒu, hand) and 殳 (shū, tool).

扌 carries the meaning — hand — and 殳 carries the sound.

Strokes 1–3 write 扌, then strokes 4–7 write 殳.

Free, with no account: the app draws each stroke, then you write it and it says which stroke went wrong.

投(tóu)	to throw, cast 用手把东西扔出去她向观众投以自信的目光。She cast a confident gaze at the audience. Lesson 345, 勇毅逐光与诗趣赤子 · 资政明辨与赤子勇毅 · Insightful Governance & Innocent Courage
投(tóu)资(zī)	to invest 把钱用在事业上，希望以后有回报园区吸引了不少企业前来投资。The industrial park attracted many companies to invest. Lesson 342, 资政强基与恪尽职守 · 资政明辨与赤子勇毅 · Insightful Governance & Innocent Courage
投(tóu)入(rù)	to devote oneself, engrossed 全部精神都放在一件事上医生全神投入为老人做体检。The doctor was fully absorbed in giving the elderly their checkups. Lesson 343, 岁月回甘与全心笃行 · 资政明辨与赤子勇毅 · Insightful Governance & Innocent Courage
投(tóu)诉(sù)	to complain, a complaint 对不满意的事情向有关部门反映餐厅设立了专门的投诉窗口。The restaurant set up a dedicated window for complaints. Lesson 344, 维权明晰与合意套餐 · 资政明辨与赤子勇毅 · Insightful Governance & Innocent Courage
投(tóu)票(piào)	to vote 指用票选出结果大家在同一间图书室投票。Everyone voted in the same reading room. Lesson 653, 铜牌评选 · 生态文明与绿水青山 · Ecological Balance & Environmental Harmony

Written with the same phonetic, so their readings tend to rhyme with each other.

All 105 of them, and what the radical means, on the 手 radical page.