น้ำหนักของ တတ္ နဲ႔ ႏုိင္

I'd like to know the differences between ႏိုင္တယ္ and တတ္တယ္. I think both mean "Can" in english , right? 
For example:
I can play football (ငါေဘာလံုးကစားတတ္တယ္)
I can eat spicy foods.(ငါစပ္တဲ့အစားအစာေတြကိုစားႏိုင္တယ္)
So I know both are used in expressing skills or sth? ? So I mean I'm confused between them. Tho I'm burmese , I don't know how to explain these to my student!! So may I know the usage of them. Can somebody help me?
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I think တတ္တယ္ is for the skills as you mentioned. 
For example like ေရကူးတတ္တယ္ = I can swim. 
It is used when we say about the skills that we learned or practiced or studied. 
ႏိုင္တယ္ is just you are able to do something (normal things)
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 " တတ္" shows ability and habitual activity. "ႏိုင္" shows ability and one's willingness to do.
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