Which itr form to use?

I am a private sector employee in India. Following are some important highlights for my FY 2018-19.

1. I am an individual salaried person.

2. I bought units of debt mutual fund ICICI Prudential All Seasons Bond Fund - Direct Plan - Growth in November-2016 and sold in September-2018. Made some capital gains in this transaction.

3. Earned dividends from some of the stocks I invested in 2015.

4. Had some income from interest on my savings account.

5. I changed my employer during FY 2018-19. So I have two Form-16 for the same year.

My queries are:

1. For AY 2019-20, which ITR form do I need to use to find my IT return online?

2. How to calculate my capital gains on the debt mutual fund investment? 

Thanks.