Sailing things right

Now I know by experience wtf is "crossed seas". There were some SW swell about 1m and another from NW about meter and a half. Once a minute they combined, amplifying reach other, creating over 3m high peak or two.
It wasn't "rolly" — it was a damn rollercoaster which I wish I never experience.
The boat was heeling so badly, that I had to roll up the mainsail and continue with genoa only because the boom was flying despite 17kn of 120° wind.

But, at least, I have reached Corsica. Mostly, just to find that anchorages here are very inconvenient — the shore slope is extremely steep and one shall choose the spot to drop the hook very carefully.