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Raspberries can boot with netboot. Some folks also say per PXE, but in a strict sense it's not PXE, just netboot.
Anyhow, I own multiple Raspberries and starting with RPi3 they can boot with netboot. I did some evaluation on this and asked for support on the raspberrypi forum in this thread. Who is interested on this topic should read the thread. RonR helped me in the thread with his netboot expertise. In addition he also wrote a nice tool which helps to setup a netboot environment quickly on a Raspberry.
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The Raspberry Pi is a nice system which is used a lot of time to provide server services to be accessible from worldwide. That's Owncloud, a HTTP server, seafile or other services..
A VPN is the right way to access the server in a secure way. But if you want to give a lot of people access there is no way other than to allow access direct from the internet. Usually you use a DMZ for this but that's a feature a normal home router doesn't have. But now you should protect the Raspberry from internet access as far as you can and also protect your home network from access from the pi server when an intruder managed to get access to the pi. But note: If an the intruder managed to get root access then the iptables firewall can be turned off very quickly. So it's very important to get SW updates on a regular base.
Following article describes how to configure an iptables firewall to protect it from unauthorized access from the internet and to protect a local home network to be attacked from the server - just in case.
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I have an old Raspberry 1B which I want to use to evaluate OpenWrt. I bought two USB32ETH adapters because the RPi1B only has one ETH interface. On following pages I describe the steps I executed to boot the system headless in my home network.
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I recently got a compute module 4 (CM4) donated to add support for NVMe in raspiBackup (See here for details). I'm used to use a Raspberry but never used a CM4 before so I had to ramp up on CM4 first. The following page describes how I managed to get a RaspbianOS (Buster) up and running on the CM4 and to boot from NVMe.
My CM4 specs: 1GB main memory, 32GB eMMC and 128GB NVMe from Hynix, no WiFi and a Waveshare Mini Base Board A (CM4-IO-BASE-A).
Note: The SD card slot on the Base Board cannot be used given my CM4 has eMMC and disables the SD card slot.
Read more: Raspberry Compute Module 4 (CM4) setup guide on eMMC and NVMe
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Every Raspberry beginner starts with a NOOBS image, which is listed by raspberry.org first as the suggested image to use (See https://www.raspberrypi.org/downloads/)
NOOBS allows to start different operating systems which is useful when you want to evaluate the different alternatives to decide which is the right one for you. Unfortunately most of the people continue to use NOOBS when they have decided which OS to use. But that's the point to setup a new image with only one operating system.
Why?