The latest RSGB 'Tonight @ 8' webinar (11th Jan 2021) was very good. Some of them have been quite clunky and awkward, but this one compresses an awful lot of interesting stuff in. The topic is 'Amateur Radio Construction' and was dual-presented by Steve Hartley G0FUW and Pete Juliano N6QW. I follow both of these guys and their knowledge spans most of 'modern' radio from the crystal receivers some of us made back in the day to the very latest SDR homebrew projects that are still in development. Pretty fast-paced in the second half (Pete doesn't like to leave any whitespace!) but you've got a pause button right there in front of you, so make use of it if needed - I know I did.