~ほど~ない
Not as much as something else
You'll be able to compare two things and say that one does not reach the other's degree.

芽衣は蓮ほど背が高くありません。
mei wa ren hodo se ga takaku arimasen.
What do you think this sentence means?
Mei is not as tall as Ren.
Say one thing is not as much as another
AはBほど~ない says A does not reach B’s degree of the quality. The item before ほど is the higher comparison standard.
今日は昨日ほど寒くないです。
kyou wa kinou hodo samukunai desu.
Today is not as cold as yesterday.
Form and use ~ほど~ない
Use a negative ending such as 高くない or 上手ではない. Reversing A and B reverses the comparison. It need not say A has none of the quality.
今日は昨日ほど寒くないです。
kyou wa kinou hodo samukunai desu.
Today is not as cold as yesterday.
バスは電車ほど速くありません。
basu wa densha hodo hayaku arimasen.
The bus is not as fast as the train.
今年の夏は去年ほど暑くないです。
kotoshi no natsu wa kyonen hodo atsuku nai desu.
This summer isn't as hot as last year.
この店のラーメンは、駅前の店ほどおいしくありません。
kono mise no raamen wa, ekimae no mise hodo oishiku arimasen.
The ramen at this shop isn't as good as at the shop by the station.
私は姉ほど日本語が上手ではありません。
watashi wa ane hodo nihongo ga jouzu de wa arimasen.
My Japanese isn't as good as my older sister's.
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