How do I report Expenses in UK self assessment

In my Koinly Tax report, I have a section of “Expenses” with a reference of These costs have not been included in your capital gains but you may be able to deduct them elsewhere on your tax return. Trading fees are already included in the capital gains and will not be shown here.

Can anyone advise where in UK self assessment i should report these expenses? what is the benefit of reporting this expenses. Any direction on this is much appreciated.

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