One of the easiest way to buy bitcoin is through a bitcoin ATM. There are several companies building these machines, which are a great way for those interested in digital currency to buy bitcoin. See our Bitcoin ATM Map to pinpoint where these machines are located in the world. 
What are the requirements to use it, please?
www.coinatmradar.com lists the individual ATMs, withdrawal / deposit limits, AML policy, current crypto rates and ATM status (online / offline) The site also lists contact details for each ATM in the event that the ATM end-user needs help or support.