Handy

Be careful when using the word 'handy'.

The main meaning is 'skillful' or 'dexterous' (šikovný, zručný)

For example:

"She's very handy with a pair of scissors."
"He doesn't seem to be very handy round the house, does he?"

Therefore you should not say

"Ask John - he's very handy."

Instead you can say:

"Ask John - he's very good with his hands."
"Ask John - he can fix/mend/repair anything."
"Ask John - he's good at repairs/practical jobs like that."