Weakening the King is suicide

Okay maybe not, but it can be dangerous, for instance let me show you an example of a disaster I put somebody into.

1.g3 e5 2.Bg2 f5?
Might be a little rought to put a ? on that move, in the game it really became justified.
3.d3 h6?

This is a really bad move, as highlighted in the diagram g6 is a really weak sqaure.
4.e4! fxe4?
This is yet another mistake and now it is getting really serious
5.Qh5+ Ke7

This is already a position where black should resign, the computer probably finds a forced mate here.
6.Qd5+ Ke8 7.Bxe4 Nf6?

Okay for fun let us try a new thing
white to play and checkmate in 2 moves
who can find it.

I will post the game this is taken from in a bit of time, so you have a chance to try without the solution.