Sub-ohm simply means the resistance of the atomiser coil is below 1.0 ohm. Sub-ohm coils are generally larger and therefore can utilise more power and cover a greater area of wick - a combination which results in massive vapour production. A high-powered device paired with a sub-ohm tank is required for sub-ohm vaping (a separate high-drain battery may also be required - 18650 batteries are often used in high-powered mods).
"Direct-to-lung" is the suggested vaping style for most sub-ohm devices. DtL vaping involves inhaling the vapour directly into the lungs in one fluid motion, as opposed to mouth-to-lung vaping, used in most lower-power devices. Mouth-to-lung vaping involves a similar action to smoking a cigarette (ie. drawing the vapour into your mouth before inhaling), and so may be better for people who have recently quit smoking.
High-VG (over 60% VG), low nicotine (6mg or lower) e-liquid is recommended when using sub-ohm devices. You may find that higher-PG e-liquids taste are too harsh to vape with a sub-ohm setup.
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