Ttransaction validation in the bitcoin blockchain I am confused. 
What is exactly a validation of transaction in the bitcoin block chain?
Please correct me if I am wrong.

I know we need 6 minner to validate our transaction and those 6 minner check whether we did the transaction or not and after that if they verify that we have done the transaction then our transaction goes to the memory pool and after that minners will try to put our transaction in the new block that they are creating to add in the bitcoin blockchain.
Transactions are validated by nodes before they are broadcasted to the Bitcoin network, and also after they are submitted as blocks.

Here are the basic steps for transaction validation:


Transaction is submitted to a node
The node does some checks to see if it is valid and standard
It enters that node's memory pool and gets broadcasted to other nodes
Miners determine if the fee rate is profitable, and if so, they begin to mine it in the next block
Block is submitted when a single miner solves the proof of work
Miner submits the block to a node
Node checks entire block including transactions
If its valid, it broadcasts it to other nodes.
Every additional block adds another confirmation to the transaction


6 confirmations is common for wallet software to consider a transaction final. That might be where you got the "6 miners" from.

Note that usually miners get and submit the block to the pool software instead of the node directly.