to make changes in archive results

1. how can I list the category archive results alphabetically (A-Z). By default it is date created (newest first).

how to do that?

There are plugins available to do that though. However wondering, if I can do it by code directly instead of installing a separate plugin for that.

2. By default archive results show in 2 columns. How can I make it 3 or 4 columns?

[Moderator Note: No bumping, thank you.]