Cold calling help

I have been sorting through old threads to try and learn some stuff from the discussions that go on here. I keep seeing people refer to 'cold calling.' The popular view is that it is bad. Can someone please explain why it is considered a bad idea?
thanks

Newbies often cold call with hands like AK, AQ, KQ, AJ, JJ, TT, 99, 88 or worse. Unsuited these are all clear 3-bet or fold hands.

Big unsuited hands play best with initative and a short pot allowing the best chance to take the pot uncontested or take free cards when you miss. By cold calling you yeild initiative.

By 3-betting you gain isolation value on the inital raiser. If it's just kept to 2 small bets it's too cheap for the blinds to come along for the ride. Give them a chance to make a really big mistake instead of a little/no mistake.

Hands like KQo, AJo, ATo, QJo, QTo, KTo, JTo and even AQo play very poorly against a tight pre-flop raiser and should be mucked. I fold AQo quite a bit pre-flop (PokerTracker helps A LOT for making this decisions.)

Bigger hands should be 3-bet for value, particularly AK.

Finally, worse hands will cap it if you give them the chance. It's hard to make up missed bets in a limit game.

See Small Stakes Hold'em for material on when you should cold call.