有点儿 vs 一点儿: a little, before or after

What is the difference between 有点儿 and 一点儿?

有点儿 goes before an adjective or verb and usually signals something slightly unwelcome: 有点儿贵, 有点儿累. 一点儿 goes after an adjective to compare or ask for a change (便宜一点儿, 快一点儿), or before a noun for a small amount (喝一点儿水). So a shopper says 有点儿贵，能便宜一点儿吗？

有点儿	before adj / verb, often negative: 今天有点儿冷
一点儿	after adj to compare: 大一点儿; before a noun: 一点儿钱

有点儿 yǒudiǎnr

From the readings on this site

咖啡三十块钱，有点儿贵。The coffee is thirty kuai — a little expensive.HSK 2 · 买咖啡
我又吃了面条，觉得有点儿辣。I then ate the noodles, and thought they were a little spicy.HSK 2 · 好吃吗
但是它有点儿贵，要三百块钱。But it was a bit expensive — three hundred kuai.HSK 2 · 红色的裙子

一点儿 yìdiǎnr