/s
This is from hellochinese, the mandarin learning app.
I like to think of 兩 being "a couple (of)" and 二 being "two" like a numeral. Like 我有兩個電話 "I have (two) a couple phones" or 我在這裡住兩年 "ive lived here for (two) a couple years".
二 is like maths, numbereng something like 2nd is 第二 or floor 2 is 二樓