The name Ahaz means possessor and holder. He did the wicked.
Walked in the ways of the Kings of Israel here means the Kings of Israel are corrupt and they worship idols.
Baal was their idol in the one of the ten tribes of Judah. Another example is their god Molek, they sacrifice their own child. Which can be related to women doing abortion just to get out of the risk in responsibility.
Deuteronomy 12:2-3 Destroy completely all the places on the high mountains, on the hills and under every spreading tree, where the nations you are dispossessing worship their gods. Break down their altars, smash their sacred stones and burn their Asherah poles in the fire; cut down the idols of their gods and wipe out their names from those places.
Therefore word in the Bible means as a result or so. Because of their sin, their enemy defeated them. By doing sin not only yourselves will affect but also the people around you. Forsaken means unoccupied.
Deuteronomy 6:14 Do not follow other gods, the gods of the peoples around you.
The 10 tribes of Judah will be an instrument to destroy Judah because of their sins. If we have anger in our heart and the "wrong motive" will become the form of idolatry, so let it be cast.
Matthew 5:7 Blessed are the merciful, for they will be shown mercy.
James 2:17 In the same way, faith by itself, if it is not accompanied by action, is dead.
Romans 2:5 But because of your stubbornness and your unrepentant heart, you are storing up wrath against yourself for the day of God’s wrath, when his righteous judgment will be revealed.
Discipline is important to us Christians, as God humbled King Ahaz. Wickedness is a general term of nature of human and result of lack of faith.
God wants his vessel to be clean. Have a pure heart. Don't be faithless.
Where does our health comes from? Only from God and not on things around you. The Word of God says "we need to fellowship". If you like doing other things like do worldly stuff rather than to fellowship with your fellow believers then it become a sin.
Lesson to learn, don't be like Ahaz. When you experience trials, turn quickly to God not to turn away from Him. It will make your faith strengthen and grow.