Learn Turkish: Zemin buz gibi soğuk ve çok sert. - The floor is cold like ice and very hard.

In Turkish, gibi is a postposition. This means it does the same job as an English preposition, but it is placed after the word it relates to. So instead of saying 'like ice', you say buz gibi (ice like).

Does the word buz need any special ending before gibi?

No, regular nouns like buz do not take any case suffixes when used with gibi. They just stay in their base form. You only need to add endings when using gibi with personal pronouns, for example benim gibi (like me).

Why is the word order buz gibi soğuk instead of soğuk buz gibi?

In Turkish, descriptive words and phrases always come before the word they describe. The phrase buz gibi (like ice) describes exactly how cold the floor is. Because of this, buz gibi must be placed directly before the adjective soğuk (cold).

Where is the verb 'is' in this sentence?

In simple descriptive sentences about the present, the third-person 'to be' suffix (like -dir or -tir) is frequently dropped in everyday Turkish. You could formally write serttir at the very end, but stopping at just sert is perfectly complete and natural.