How do I interpret this?
ADF t-value = -4.76 Critical Values -2.57823 -2.883037 -3.47937
ADF t-value = -1.23 Critical Values -2.57823 -2.883037 -3.47937
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On the basis of your ADF teat I would conclude that your first series is stationary. You did not state which ADF test you used. Looking at the first differences appear to be increasing as the series increases. Consider using a log transformation of the data.
On the basis of the ADF test the second series is non-stationary. The series looks as if it has a strong seasonal component which you should also consider