Suggested answers for stressed words in the 1st secret and here is the second one,

 Suggested answers,

1. PHOtograph (N)  2. phoTOgrapher (N)   3. photoGRAPHic (A)

(N): Noun     (A): Adjective

 The second secret: SENTENCE STRESS

Sentence Stress is golden key number two for speaking
and understanding English. With Sentence Stress, some
*words* in a sentence are "stressed" (loud) and other
words are weak (quiet). Look at the following sentence:

We want to go.

Do we say every word with the same stress or force? No!
We make the important words *big* and the unimportant
words small. What are the important words in this
sentence? Yes, you're right: WANT and GO.

We WANT to GO.

Now let's try again to stress these following sentences

We want to go to work.

We don't want to go to work.

We don't want to go to work at night.

  Sentence Stress -" very important"