What is unique about conjugating the verbs "tener" and "hacer"?

I'm confused in what its asking

How are those verbs different from other -er verbs when you conjugate them?

https://www.google.com/search?q=conjugate+spanish+-er+verbs&oq=conjugate+spanish+-er+verbs&aqs=chrome..69i57.8413j0j7&sourceid=chrome&ie=UTF-8

These links might be better —

https://www.spanishdict.com/conjugate/tener
and
https://www.spanishdict.com/conjugate/hacer

What is there in these conjugations that is different from the conjugations of other -er verbs?

taking this quiz rn

The verbs "tener" and "hacer" are unique in their conjugation in two main ways:

1. Stem Changes: In the present tense, both verbs undergo stem changes in the yo form.

- For "tener," the stem "tien-" changes to "tengo" in the yo form. Example: "Yo tengo" (I have).

- For "hacer," the stem "hac-" changes to "hago" in the yo form. Example: "Yo hago" (I do/make).

These stem changes do not occur in any other forms of these verbs.

2. Irregular Forms in Other Tenses: Both verbs have irregular conjugations in certain tenses.

- In the preterite tense, "tener" has an irregular third-person singular form "tuvo" (he/she/it had) and "hacer" has an irregular first-person singular form "hice" (I did/made).

- In the imperfect tense, "tener" has an irregular first-person singular form "tenía" (I had) and "hacer" has an irregular first-person singular form "hacía" (I used to do/make).

These irregular forms make the conjugation of "tener" and "hacer" different from regular verbs in those tenses.

To confirm and fully understand these unique conjugations, you can consult a reliable Spanish verb conjugation resource, such as a conjugation website, verb conjugation book, or language learning app.