Redirect Main Home Page url to category URL without plugin

I am looking for best method without any plugin that will redirect my homepage to category url. e.g

Main page: https://uk49sresult.co.uk/

Direct redirect to this one.

Category URL: https://uk49sresult.co.uk/lunchtime-results/

It helps me to reduce the servers response time.

I have readed many answers but not provided full guideline. Please briefly explain me which code will paste to which file. I have no experience of programming but work a little bit.