Tithe where you are fed the true word of God, not false doctrines, traditions and commandments of men. Traditional teachings lead you to believe that you can buy blessings and salvation; not so, they are not for sale. What is the truly important matter? The important matter is to support the teaching of God's true word; feed more people with the truth.
Please study each verse first in the KJV Bible; see for yourself. Personal interpretation about each verse or set of verses follows in parentheses.
2 John 1:9-11 (Verse 9: 1 doctrine; one God! If you wander from the teachings of Christ (His doctrine), you will leave God behind; but if you are loyal to Christ and His teachings, you will have both the Father and the Son. It is very clear. Verse 10: John is saying, If anyone comes to you teaching anything other than what Christ taught, don't even invite them into your home. Don't encourage them in any way. Verse 11: If you encourage or support them in any way, you become a partaker of their evil deeds and wickedness. When you tithe to a church that is not teaching the truth of the Word, you become a supporter of their false teaching. Are you absolutely sure you want to do that)?
Proverbs 11:4 (You can't buy your salvation. Believing in Him and repenting of sin results in eternal life).
Zephaniah 1:18 (Again, you can't buy your salvation. See 1 Peter 1:18 also. Don't let traditions of men mislead you).
Acts 8:18-22 (These 5 verses in Acts are saying that the Holy Spirit is a free gift from God, it is not to be purchased with a man's money. Did you know that)?
Tithing actually has a true purpose. We are encouraged to aid and support the sharing of God's true word, not to muzzle it or counter it by supporting false teachings. What happens when we support the teaching of God's true word? By tithing correctly, His truths can be shared with more people; this results in increasing the size of the Kingdom of God. What happens if we support someone that teaches falsely? 2 John 1:11 tells you; the result is the Kingdom decreases in size.
How do you know if a teaching is false? See if it checks out in God's word; verify it, one way or the other (is it true or false?). Try the spirits, see 1 John 4:1. This responsibility falls on each and everyone of us; we as individuals must take action by verifying it one way or the other.
Keep studying the entire Bible. You'll be absolutely amazed at what is actually in there.