http://diyujk2zysqttdd2dvsomeus44mfwgtdzwwd3sgkjxps64us4uumr6qd.onion/howto
Maybe the first and most secure way for you is a Bitcoin ATM near you. If you live in a bigger town, there is a good chance that there is a Bitcoin ATM somewhere in your city. Try googleing "your town name + Bitcoin ATM" for a start.
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