Do characters like 司, 习, and 可 have different first strokes? I'm interested in the first stroke of characters like 司, 习, and 可.  This is how it looks on my computer (but I don't know if this is a matter of fonts):


可 starts off with a single horizontal stroke, whereas
司 and 习 do not (it starts off horizontal, then proceeds downwards, then hooks).


My handwriting of 可以, 学习, and 司机 (where I've deliberately used the two "styles"):



I'm not sure if it's simply wrong to write this, or if they're acceptable alternatives.

Question: Do characters like 司, 习, and 可 have different first strokes?
We can use zdic's 笔顺 for this:

司


  フ一丨フ一


习


  フ丶一


可


  一丨フ一丨


So technically 司 and 习 begin with a 折 stroke, while 可 begins with a 横 stroke.

笔顺 works like:

笔顺名称    一（横）    丨（竖）    丿（撇）    丶（点）    乛（折）

笔顺编号    1   2   3   4   5