Free Books (Ebooks) by Desiring God contain tens of books that are free to download and also previews of great books that you may want to read as well! Buy them if you want a hard copy. Particularly, Coronavirus and Christ may be an interesting book to read!
Knowing God is a book that talks about the attributes of the Christian God and how a Christian ought to live if he claims to know this God.
Who is Jesus? is a book that shares the most central person of our faith -- Jesus.
The Reason for God by Tim Keller is a fantastic book.