Salome,
The whole of the Old Testament points to Christ and God's redemption of mankind. It also give precise accounts of people, kings and historical events and a simple explanation of the creation of the world--an interesting fact. NASA had an article a number of years ago stating that light existed
before the sun, moon and stars came into existence--this is EXACTLY what Genesis states.
In the Old Testament the pre-incarnate Christ appeared to Abraham, Isaac, Jacob, and Moses--he was also the priest Melchizedek--note that he is not flesh and blood, but like the angels takes on human form--even many Christians are unaware of this.
You can read more here:
https://www.wordsoffaithhopelove.com/jesus-in-the-old-testament-christophanies/
Also their are many prophecies pointing to Christ--for example the Book of Daniel
http://www.abideinchrist.com/messages/danielchristcomingmessiahprince.html
Here is an article that discusses the differences in the Old and New Testament
https://www.compellingtruth.org/God-different-OT-NT.html
The prophet Isaiah prophesied Christ paying the penalty for our sins
700 years before Christ was even born.
Isaiah 53: 4-12 (and this is just one example of several)
Surely he took up our pain
and bore our suffering,
yet we considered him punished by God,
stricken by him, and afflicted.
5 But he was pierced for our transgressions,
he was crushed for our iniquities;
the punishment that brought us peace was on him,
and by his wounds we are healed.
6 We all, like sheep, have gone astray,
each of us has turned to our own way;
and the Lord has laid on him
the iniquity of us all.
7 He was oppressed and afflicted,
yet he did not open his mouth;
he was led like a lamb to the slaughter,
and as a sheep before its shearers is silent,
so he did not open his mouth.
8 By oppression[
a] and judgment he was taken away.
Yet who of his generation protested?
For he was cut off from the land of the living;
for the transgression of my people he was punished.[
b]
9 He was assigned a grave with the wicked,
and with the rich in his death,
though he had done no violence,
nor was any deceit in his mouth.
10 Yet it was the Lord’s will to crush him and cause him to suffer,
and though the Lord makes[
c] his life an offering for sin,
he will see his offspring and prolong his days,
and the will of the Lord will prosper in his hand.
11 After he has suffered,
he will see the light of life[
d] and be satisfied[
e];
by his knowledge[
f] my righteous servant will justify many,
and he will bear their iniquities.
12 Therefore I will give him a portion among the great,[
g]
and he will divide the spoils with the strong,[
h]
because he poured out his life unto death,
and was numbered with the transgressors.
For he bore the sin of many,
and made intercession for the transgressors.