resistance - Analysing a circuit to determine what is in series or in parallel

This is probably a very basic question but I have the following circuit, I am not sure what is in series and what is in parallel or if they are all in parallel, initially I thought R2 and R3 were in series and then used the sum of their resistances with R1 to calculate the equivalent resistance, that seems to be off based on some circuit simulation software I am using so I would appreciate if somebody could explain how to calculate the Rt and the logic behind it.

Thanks.

^{simulate this circuit – Schematic created using CircuitLab}

Answer

An easy thing for the beginner to do, is color the nodes.

Now, any components that have the same color (node) on each end are in parallel. So, R2 and R3 have green and purple on each end (respectively) so they are in parallel.