In Galatians 5:18 Paul (Saul, Sha'ul) wrote,

"But if you are led by the Spirit, you are not under the Law."

Does that mean if I am led by the Holy Spirit, I won't keep the Law?

No, in fact it means the exact opposite. The Torah (Law, instruction) is a gift from God. It describes how to be a blessing to God and to one another. Take an example from our modern system: If I am allowing myself to be led by the Holy Spirit, I won't drive recklessly and as a result I won't be subject to the penalty of the traffic law.

Its the same with the Torah Law. If I'm not breaking the Law, I'm not under threat of the penalty of the Law.

The Ruach Hakodesh (Holy Spirit) will never lead me to break Torah. Verses 22-23 list the character traits and actions that are the Fruit of the Spirit. Then verse 23 says, "Against such there is no Law." So by definition, if I am truly being led by the Spirit, I am not breaking the Torah.

Galatians 5:18 can best be understood as saying, But if you are being led by the Spirit, you are not under [the penalty of] the Law.

How can you be led by the Ruach Hakodesh? First ask to be given a gift: the gift of faith in Messiah Yeshua. When you have received that, ask for the Holy Spirit to live within you. Then you will begin to learn, and to listen, and to respond.