Here is a list of some fantastic resources to understand more about Christianity:
Bible Gateway ⧉ - A searchable, online Bible - great for finding or printing specific Bible passages.
Reboot ⧉ - A great youtube channel answering all sorts of tough apologetics questions, specifically designed for youth (often featuring famous speakers).
Got Questions ⧉ - A very useful resource with answers to all kinds of questions about God, the Bible and Christianity.
The Bible Project ⧉ - The Bible Project team create videos that help people understand the Bible and all their complex themes in a way that is engaging, approachable, and transformative.
Andy Banister's Blog ⧉ - The blog of Andy Banister, with a PhD in Islamic Studies. He writes thought-provoking articles on FAQs about Christianity and other religions.
Wycombe Youth For Christ⧉ - Another local youth organisation, who provide support and resources for local CU's. They have a playlist of brief devotionals here.