Can we say certaines feuilles même ressemblent comme l’or instead of à de l’or.... actually I don’t understand à de l’or?

Hi Manpreet Kaur, 

The verb 'ressembler à quelque chose' means to look like something.

In the following list, you will find -

'ressembler à quelqu'un' = to look like someone 

https://progress.lawlessfrench.com/learn/theme/3907231

Many verbs in French are followed by the prepositions à or de, just beware not to translate literally what you see in English.

Hope this helps!