Markus has made a good point. And I must emphasize they are not “instant win ships”.
T2 frigates are specialised. They perform better in their intended role than the equivalent T1, but at a cost. The T1 has more general ability.
For example, the Magnate (the Amarrian T1 explorer) can be fitted for combat, it’s not good, but it’s not hopeless. It’s s reasonable explorer, not good remaining hidden but cheap enough that loosing it isn’t the end of the world.
The Anathema, the Amarr T2 explorer, is much better at remaining hidden and exploring dangerous areas. It can fit a covert cloak (NEVER fly without the covert cloak). But it’s expensive, lightly armoured and is almost incapable at combat.
The T2 logistics frigate is similar. A better logistics ship, but weaker in every other role.
The E-war ships are different; in some roles (mainly fleet support) the T1 ship is better than the T2. The Crucifier is a good example.
Don’t train T2 hulls before you can fit them well. That means T2 armour/shields and weapons.
So saying, I’ve trained T2 frigates and use the for their various roles in place of the T1s. Just be aware they are specialised - but very capable in their roles.
I’d also recommend looking at the Tactical Destroyer - a more multi-purpose and highly capable ship.
There’s a lot of people live in high sec and day trip into low, null or wormholes depending on their wishes, time and interests. I do.