Learn Dutch: Ik vind de literatuur uit die eeuw steeds boeiender. - I find the literature from that century increasingly captivating.

We use vinden when expressing a direct personal experience, feeling, or subjective opinion about something you have interacted with. Because you are reading the literature and experiencing it as captivating, vinden is the right choice. Denken is used for facts, assumptions, or thoughts happening in your head (like 'I think it is raining').

I learned that steeds means 'always' or 'still'. Why is it translated as 'increasingly' here?

When steeds is placed directly in front of a comparative adjective (like boeiender, meaning 'more captivating'), it means 'increasingly' or 'more and more'. So, steeds boeiender translates to 'increasingly captivating'.

Since de literatuur is a de word, shouldn't boeiender get an -e at the end?

No, because boeiender is not placed directly in front of the noun it describes. It acts as a predicate adjective here, stating what you find the literature to be. Adjectives used in this position never get the -e ending, even when they are in the comparative form.

Why use uit for 'from that century' instead of van?

Uit is commonly used to indicate origins, including the specific time period something was created in. You use uit to convey that the literature 'comes out of' that specific era.