今

1. Origins, structure, and basic meaning

• Structure: 今 (いま) means the present moment or something belonging to the present period. 今から is an action's starting point; 今の仕事 modifies a noun temporally.
• Basic usage: Leaving for the station now permits catching a train; past experience helps with one's current work.

2. Common pitfalls and similar expressions

• Present as departure point and present period defining a job
  • から sets the time from now onward; の links the current period to a job. The latter means one's work at present, not only an action at this instant.