Welcome @shlokpimpalkar,
You asked several basic questions (3 postings today) which might get support by studying related Help Center articles, please, see e.g.
Question types: List of Question Types — KoboToolbox documentation
Skipping:
Adding Skip Logic — KoboToolbox documentation
Validation:
https://support.kobot/validation_criteria.html
“Other” choice:
User-Specified “Other” Responses for Multiple-Choice Questions — KoboToolbox documentation
HXL tags:
Using HXL Tags — KoboToolbox documentation
Seed:
XLSForm Docs
Etc.
Also the XLSForm dokumentation may be helpful: XLSForm Docs
And often using the search function of this forum often can also provide answers and examples. e.g. for “seed”: How to use the Seed function when randomizing response options?
