You could also get DirectAdmin and install it yourself on your VPS, however, you need to make sure the VPS has the requirements needed for it to function proplery.
It was not a good buy (Does not matter whatever less the charges were). Even though he can add the panel later, the problem starts to configure things correctly.
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if you are hosting single website as a beginner then you may start exploring unmanaged VPS without control panel to host single website. it is also a good way to start building necessary skills... it will save you lots of money in the long run once you've mastered it as it will cut your dependence in control panel.
if it is just for single site use VPS or just hosting a few website which belongs to the same person, just run it without any panel, do it manually and save the RAM!