I fly a drone that weighs under 900g, so I fall into the A1 subcategory.
Markings: My drone must bear a CE marking and the C0 or C1 class identification label. If I fly a drone without a class identification label, the transitional category rules apply to me.
Registration: I must register as the operator of the drone on the online drone platform UAS.gate and label the drone with the UAS operator number. Registration is free of charge.
Certificate: If I want to fly in this drone category, I have to obtain the A1/A3 certificate. To do this, I complete a self-study training course and an exam (multiple choice, 40 questions) on the online drone portal UAS.gate. After passing the exam, the certificate will be issued. The training and exam are free of charge.