Data contains information on other data, such as details about a particular transaction's properties.
Candidate Block
In a few words, a candidate block is a block that a mining node (miner) is trying to mine in order to receive the block reward. So a candidate block may be described as a temporary block that will be either validated or discarded by the network. Miners compete with each other to validate the next block and add it to the blockchain, but first, they have to create a candidate block to participate in the mining competition.
Testnet
An alternative blockchain used by developers for testing.
Active Management
Active management in crypto refers to an investment strategy where portfolio managers actively make buying and selling decisions to try to outperform the market and generate higher returns.