Before knowing about Karma, one has to decide whether he likes this material world and the life he\'s living or not. Mostly everyone likes to get liberated (Mukthi) as all Shastras are advising that. They are Type 1. Few people are there who are very practical in approach and who enjoys the material pleasure. They don\'t like to get liberated (mukthi) from this world. They will say both heaven and hell are in this earth itself and hence they like to live here. So based on that only, we should accumulate Karma.
What is \'Karma\'? \'Karma\' literally means \'Action\'. But philosophically what we mean is the causes and effects of our actions. It\'s like a Bank A/C. If you do good Karma, it\'s like crediting money in your A/C. If you do bad Karma, it\'s like debiting money from your A/C.
As per Shastras, there are two types of Mukthi. One is real and permanent and the other one is not real and temporary. The second one is going to Heaven (Swarga Loka) where many Devas are there and that abode is ruled by Lord Indra. If we accumulate too much good Karma, we\'ll go there and enjoy there for sometime and will again take birth here in a good family and good position. Since we are taking re-birth after sometime, it is not a real mukthi and a temporary one.
The first one is getting liberated and going to the eternal world like Vaikunta / Goloka Vrindavana etc for Visista Advaitis and Dwaitis and getting mingled with Bramham for Advaitis. For this, you shouldn\'t have any Karma itself. The Bank Balance should be \'0\'. If you have either positive or negative Karma, you should take birth here. How can you be free from Karma in a material word? For that Lord Krishna has said in Bhagavad Gita, \"Without being attached to the fruits of activities, one should act as a matter of duty, for by working without attachment one attains the Supreme. Therefore surrendering all your works unto Me, with full knowledge of Me, without desires for profit, with no claims to proprietorship, and free from lethargy, fight.\"
If you wanna know more about Karma, read Bhagavad Gita, especially the 3rd Chapter, \"Karma Yoga\". You\'ll get to know everything about Karma.