Most efficient BitCoin Miner: Honey Miner
Do you have a graphics card in your computer? If yes you could mine BitCoin with the Honey Miner app. Cryptomining has become very popular over the past years and also profitable. Most people opt to use NiceHash to mine their bitcoin but there is a more recent program, honeyminer, that can mine cpu and gpu while giving you more for what you mine.
You can get HoneyMiner through this link: https://honeyminer.com/referred/5aslt