Difference between Dentro vs. Por dentro

Difference between Dentro vs. Por dentro
 

I have difficulty understanding the difference between words like 'dentro' and 'por dentro'. Also ones like 'bajo' and 'bajo', 'atras', 'detras', and 'tras', and how to use them. Could someone please explain? Thanks :)

Welcome to the forums!

This thread may shed some light on a few of your difficult words ('bajo' and 'debajo de', 'tras' and 'detrás de').
Here's another (atrás).

For us to better explain the difference between dentro and por dentro, you may want to include the context.
Generally,
dentro = inside
por dentro = 'a deeper' inside