Hi Swar, believe me a weekend is not enough to learn yoga. Practicing yoga needs constant guidance and observation. If you learn hastily and practice wrong postures at home, it can be a disaster in long run. My suggestion will be to get a yoga teacher in your locality and off course you can enjoy a weekend at Rishikesh.
Glad to know that you are visiting Rishikesh during the weekend to learn yoga and it’s indeed a fantastic destination to explore as well. Ekattva Yogshala is one of my personal favorite yoga schools in Rishikesh, located in the Visthapit area. Highly recommended if you are concerned about the budget like me. Check out their website for more clarity: https://www.ekattvayogshala.com/
Cheers!