تبدل اللغة: فرنسي-عربي (العامية السورية/اللبنانية)

Be it ... Can someone please explain to me the use of ''be it''..? Is this sentence correct: ''I will go on practicing my Spanish, be it in Argentina, Spain or Mexico''.

Does ''be it'' sound old fashion?

If or whether? Can someone please explain to me the right way to use ''if'' and ''whether''? For instance, is this sentence correct: ''I'm not absolutely sure whether I'm sitting in the second class car''