Can I use triac to control 220V home appliances like coffee heater,immersion rod etc. Please suggest a tutorial in that case.
What are the other options available??
Yes you can.
but you need a optocoupler to isolate 5v microcontroller from 220v triac.
your setup could be: microcontroller -> gate of triac.(traic gate terminal will be used to trigger the AC appliance.)
220 v to home appliance through TRAIC.