Alt in pictures?

Question

Search Engine Optimization

Good afternoon!
Please tell me, a gallery site is being created (with photos). It will have several categories and then there will be a page with all the photos of this category. The client wants his pictures to be displayed in Yandex and Google pictures, googled it, it says that altos are responsible for this. Please tell me, for each picture from each category, you need to register different altos or for one category, you can register the same alt for all pictures?

Answer 1

for SEO alta insofar as, so don’t rejoice oosbo
but yes - everything must be made unique

Answer 2

The viola should have what is shown in the picture, if the same and viola can be the same

Answer 3

Better of course different alt for each picture.
Or at least add type numbering:

<img src="" alt="пейзаж 1">
<img src="" alt="пейзаж 2">
<img src="" alt="пейзаж 3">