ことはない => Not necessary N3
Needs, Requirement
っこない => A is definitely not possible N2
Potential, Possibility
どころではない => Its not A N2
Contrast,Surprise
に[越「こ」]したことはない => It's better if A, it's better if it's A N1
Comparison/ Exchange
ことになっている => Plan, rule, decide N2
Information, Report
ところを/ところに/ところへ => At time/situation A N2
Information, Report
[少「すこ」]しも~ない => Not (even a little) A N3
Not only, Not even
ことのないように => So as not to A N1
Will, Decision, Doing
ないことはない => There is a (small) possibility of A. A is not impossible. N3
Potential, Possibility
ということは => A In other words, B; A Oh, so B N2
Adjectival, Descriptions
ところ => Have done N4
Situations and Experiences
こと => Do A (command) N2
Will, Decision, “Doing”