For example, seconds. Also, many of the more "technical" units, that are used in science and technology, but not so much in the daily life of a common person - for example, ampere, coulomb, henry, watt, ohm, tesla, etc.
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There are none. The second, although a unit in the SI system is, strictly speaking, not in the metric system since it is based on 60.
Only three countries still cling to the "English" system, whereas the whole world uses metric. The SI units were established in 1960 as part of a review of the metric system used at the time; it uses metric units because it is the current version of the metric system.
A linear meter is a meter, in a straight line, as opposed to cubic meter, which covers a 2-dimensional plane. They are both part of the metric system. There is no metric meter, other than just referring to a meter as being part of the metric system.
A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system. Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
Yes, there are units smaller than a yoctometer. The yoctometer (10^-24 meters) is part of the metric system, and smaller units can be defined using scientific notation, such as zeptometer (10^-21 meters) or even smaller hypothetical units, like the Planck length, which is approximately 1.616 x 10^-35 meters. However, these smaller units are primarily theoretical and not commonly used in practical measurements.