First one looks like garlic mustard (Alliaria petiolata), a member of the mustard/cabbage family, self seeds everywhere, but can be eaten and is the principal food source for caterpillars of the Orange Tip butterfly.
Second one looks very like Honesty ( Lunaria annua), again a member of the cabbage family.
Only you can decide whether you consider them to be desirable or not! In my view there is no such thing as a 'weed', only wild flowers, many of which are as beautiful, if not more so, than deliberately grown cultivars. And please consider the wildlife benefits, particularly for pollinating insects!