Q1: What Jmeter modes exist?

Q2: Where can I change the amount of RAM allocated to JMeter

Q3: Why would you add or remove things from JMeter scripts in GUI mode... But for the actual load generating go over to CLI mode

Q4: What is the use of the flag -n with the JMeter CLI interface?

Q5: What flag needs to be selected in the JMeter CLI mode to enable a proxy