No, not at all; that's not Go. Just continue to play serious games and get reviews.

That is a really profound question. There is no simple answer.

A minor answer is this: pros advocate balance in the fuseki - not getting all of your stones one one side of the board. Doing so involves the possibility that your stones will become overconcentrated and thus inefficient. ( Don't worry about the fact that you might not yet recognize when stones are overconcentrated. Soon enough, you will )

A bigger and more relevant answer is this: Often the first person to safely tenuki gets an advantage. Tenuki means to play somewhere else. Often it involves a small loss locally in return for a larger gain somplace else.
You see, when a bunch of stones are played in the same area, as that area gets more crowded, each stone usually is worth less and less. When you play a stone in an open area, you -temprarily - have 100% of the stones there. That's good for you, obviously. When the second stone is played, it is 50% of the stones. When you play the twentieth stone in a particular area, it may well be worth only 5%. So, unless playing that last stone is a matter of life and death, it may well be worth it to ignore the local 5% and go for 100% somplace else where there is more room.

The idea that moves become worth less and less, both locally and globally, is referred to as temperature.

( I recommend going to Sensei's library and looking up all of the words in bold above. )

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