Direction of laying parquet / parallel or perpendicular to the hallway?

Especially when you lay through all doors and passages without expansion joints, it is hardly possible without a good plan or a lot of experience. It really takes a lot of luck that it doesn’t look stupid or that there isn’t fiddling somewhere in the end or it doesn’t fit...

This is not rocket science either. As I said, measure and calculate once beforehand how much will remain in the end and then start accordingly with a whole or half plank. For that, decent tools (a good jigsaw and a plunge circular saw with a guide*) and above all: patience. Better to think twice and measure three times. Then it will work out. *from FESTOOL - and I think also from other manufacturers - there is a cutting guide. Purchasing it was worth its weight in gold, because it made the work incredibly easier and faster. For the baseboards, however, I recommend a classic miter saw.