In German, das gleiche refers to We both read the same (das gleiche) book (everyone has its own, but they look exactly the same) while das selbe refers to We both read the same book ...
Spanish has, to my knowledge, more possible suffixes than for example English or German. Many adjectives can be transformed into nouns by adding -ness, -ism, -ity in English, or -keit, -heit, -ismus ...
In Spanish, adjectives typically come after the noun they modify. However, there are some cases when the adjective comes before the noun, and usually (always?) with a change in meaning. Example: ...