Second Conditional • Meaning
It’s a hypothetical condition and it’s probable result. It’s results are unlikely to occur.
Second Conditional • Examples
If (condition in past simple tense), would (result in present simple tense).

If I won the lottery, I would buy a Porsche.
If I were rich, I would buy a house.
If I was rich, I would buy a house.
Second Conditional • Ways To Teach
Teach students use “were” for academic cases, and “was” in a mode conversational way. Ask them about crazy dreams and wishes, and help them put it in the second conditional.