What is a DDoS attack? How to protect yourself?

Question

DDoS Protection

Today the host sent a letter. That is all I have. The site has a lot of traffic (about 55 thousand views per day), but today it shows that the load on the channel has increased several times. I've never experienced this before, what should I do? I don't even have access to the server. Only SSH console in VMmanager. OpenVZ virtualization.
The most interesting thing is, if this is DDoS, then who needs it, a regular site does not sell anything, just information with databases. All content is free.

One of your virtual server IP addresses has been blocked. The automatic monitoring system has detected anomalous incoming traffic to IP address *********** during the last 10 minutes: an average speed of 297.2 Mbps with an average packet size of 804 bytes. Such a load disrupts the network and creates problems for other data center clients.

Main traffic sources:
(84.54.95.213) TCP 19.0M bytes with packet size 450 bytes on port 443.
h3.dns2host.com (178.63.193.112) UDP 11.0M bytes with a packet size of 1408 bytes on port 80.
94-237-96-93.de-fra1.upcloud.host (94.237.96.93) UDP 10.9M bytes with a burst size of 1396 bytes on port 80.
(37.156.146.170) UDP 10.7M bytes with a packet size of 1401 bytes on port 80.
static.189.69.216.95.clients.your-server.de (95.216.69.189) UDP 10.5M bytes with a packet size of 1410 bytes on port 80.
mail.krinetzki.de (94.130.18.135) UDP 10.5M bytes with a packet size of 1405 bytes on port 80.
(94.140.201.182) UDP 10.4M bytes with a packet size of 1402 bytes on port 80.
static.183.200.201.138.clients.your-server.de (138.201.200.183) UDP 10.4M bytes with a burst size of 1424 bytes on port 80.
(94.140.200.60) UDP 10.3M bytes with a packet size of 1407 bytes on port 80.
89.185.97.36.net.netplanet.at (89.185.97.36) UDP 10.3M bytes with a packet size of 1394 bytes on port 80.
static.102.27.76.144.clients.your-server.de (144.76.27.102) UDP 10.2M bytes with packet size 1402 bytes on port 80.
static.157.222.217.95.clients.your-server.de (95.217.222.157) UDP 10.1M bytes with a packet size of 1391 bytes on port 80.
ip-77-140.telehouse.bg (78.128.77.140) UDP 10.1M bytes with packet size 1425 bytes on port 80.
(94.140.200.94) UDP 9.8M bytes with a packet size of 1412 bytes on port 80.
(51.77.196.105) UDP 9.8M bytes with a packet size of 1397 bytes on port 80.
(94.140.201.181) UDP 9.2M bytes with a packet size of 1422 bytes on port 80.
(176.110.134.11) TCP 9.1M bytes with a packet size of 40 bytes on port 443.
0851191089.static.corbina.ru (78.107.234.40) UDP 7.6M bytes with packet size 1422 bytes on port 80.
ec2-3-216-171-47.compute-1.amazonaws.com (3.216.171.47) UDP 7.4M bytes with a packet size of 468 bytes on port 80.
ec2-52-88-203-15.us-west-2.compute.amazonaws.com (52.88.203.15) UDP 7.3M bytes with a packet size of 468 bytes on port 80.

Answer 1

https://www.cloudflare.com/ru-ru/lp/ddos-x/?&_bt=4...
the best protection option