God will never lead you astray.
He will not lead you away from the correct path or direction He has purposed for your life. 
And He will teach you all you need to know, so your purpose will be fulfilled.
So that in your life, where there is grief, it will be turned to joy.

Psalm 119:105 tells us, “Your Word is a lamp for my feet, a light on my path”.

The Holy Spirit will not lead you into error or morally questionable behavior.
The Holy Spirit is a Guide who helps you understand the Word of God (scriptures).   
The Holy Spirit teaches believers, helping them understand God’s Word and apply it to their lives.

John 14:26 states that the Holy Spirit, sent by the Father, will “Teach you all things and bring to your remembrance all that I have said to you”.

John 16:13 states,

But when He, the Spirit of truth, comes, He will guide you into all the truth.
He will not speak on His own; He will speak only what He hears, 
And He will tell you what is yet to come.