Some people orient the stripes in one direction but thats only for. Does a resistor have polarity why or why not no the resistors are bidirectional and can therefore be used in both directions.

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Resistor polarity matter. It doesnt matter which way you connect the wires. There is no polarity to a resistor. Do not go wrong with the colored lines its just to say the approximate resistance.
By definition a resistor is a device that follows ohms law and does so regardless of the polarity in which it is inserted into a circuit. Manufacturers of resistors do all they can to make their. You can solder it in either direction and the circuit operation will be unaffected.
If you assume a current direction then the polarity you mark on a resistor is positive where the assumed current enters and negative where it leaves the resistor. That depends on the type of thermistor some solid state thermistors are only able to run on one correct polarity and so are direct current. They are just like a resistor in terms of polarity and they allow to measure temperatures because their resistance varies with temperature in a predictable way.
No they have no polarity. If the current turns out to be negative when you solve the simultaneous equations then the direction you guessed was wrong.

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