Learn Turkish: Bu ilanı duvara yapıştırdım. - I stuck this notice on the wall.

In English, we focus on where the notice ends up (on the wall). In Turkish, verbs of placement like yapıştırmak (to stick) focus on the movement of the object toward its destination. Because you are moving the notice onto the wall, you must use the dative (direction) case -a.

Why does ilan (notice) have an -ı at the end?

The -ı is the specific direct object marker (the accusative case). Because you are talking about a specific notice (bu ilan - this notice), you add -ı to show it is the direct target of your action.

I learned that yapışmak means to stick. Why does this sentence use yapıştırdım?

Yapışmak means something sticks on its own (like a sticker sticking to your finger). To say you stuck something else to a surface, Turkish uses the related verb yapıştırmak. The -dı shows past tense, and the -m is the personal ending for I.

Could I change the word order and say Duvara bu ilanı yapıştırdım?

Yes! Turkish word order is flexible, but the word right before the verb gets the most emphasis. In the original sentence, duvara is emphasized (you stuck it on the wall, not the window). If you swap them, the focus shifts to the notice.