LTCG Clarification for Individual

My Gross Income is less than 1 lakh (including Saving A/c Interest, Annuity Pension etc) and I am NOT a senior citizen.  I would like to sell my shares which I have been holding for a long time (more than 5-10 years).

My question is, If I sell shares and make a profit of 5-10 lakhs range, how much will i have to pay tax or how to calculate the tax on LTCG?

Is there a better way to sell shares and still not required to pay tax?

Thanks in advance for the suggestions.