请(qǐng)教(jiào) means 'ask suggestion from others' while 指(zhǐ)教(jiào) means 'give suggestions to others'.
For example,
1) 我 向 您 请教
wǒ xiàng nín qǐngjiào
I towards you consult
'I consult with you'
2) 请 您 指教
qǐng nín zhǐjiào
Please you give suggestions
'Please give me some suggestions.'