The holiday feasts of God point to Christ!

A critical and crucial area to know well in teaching and preaching God's trustworthy Word and His plan of Redemption (clearly an OT and NT thing!) is the place of the feasts in the OT as they point to Christ and God redemptive plans.
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Since Rosh Hashanah or the Feasts of Trumpets begins today Sept. 15th at sunset and goes to sunset on Sunday, Sept. 17th. With this in mind and knowing that this feasts. Online Christian encylopedia GotQuestions says...
"The Feast of Trumpets, along with the other six festivals of the LORD, foreshadowed certain aspects of the ministry of Jesus Christ. The prophets linked the blowing of trumpets to the future Day of Judgment: “Blow the trumpet in Zion; sound the alarm on my holy hill. Let all who live in the land tremble, for the day of the LORD is coming. It is close at hand” (Joel 2:1; see also Zephaniah 1:14, 16)."

In the New Testament, we see that the Lord’s Second Coming will be accompanied by the sound of a trumpet (1 Corinthians 15:51-52; 1 Thessalonians 4:16-17). Each of the judgments in Revelation 8-9 is also signaled by a trumpet. Just as the shofar called the Jewish nation to turn their attention to the Lord and ready themselves for the Day of Atonement, so will the “trump of God” call us to heaven and warn the world of coming judgment.

All we read and study the OT it gives to us a pictures of God's truths of the Lord Jesus Christ and redemption though Him. Follow the link to find the free booklet on the The Holidays of God - Fall Feasts. You can also find the Spring Feasts for free as well with a quick search.
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https://discoveryseries.org/.../the-holidays-of-god-the.../
Blessings!