Is it better to do one lump sum or invest bits each month? Are you charged transaction fees each time you buy more of the same share or how are fees charged on degiro?
There is a separate fee for each transaction.
Depends on the amount of money you have to invest of course. I've always found them reasonable when it comes to fees, they do offer some ETFs (the more well known index trackers such as S&P etc) which are free of fees well least initially. As the user above stated separate fees for each transaction.