SCART to HDMI converters are the cheapest and most simple solution. Make sure they (really) support RGB and not only composite video, like the cheapest SCART to HDMI converters usually do. RGB SCART converters start at around 30€ (2022). They will usually work and you will probably first think, that this is perfect, but they usually add a hefty lag to your screen, easily 120ms or 6 frames.
[https://youtu.be/7VOsOuQ5mhM?t=587 Avoid Scart to HDMI converters for gaming]. It's fine if you only want to do a bit of BASIC programming or play adventures, but it's not good for action games.
==== Scan converters ====