I take notes in the field about wind speed, temperature, exact location, unexpected events, battery number, etc. Then when I get home I open my log book spreadsheet and fill it in foe each individual flight.
Time at motor start;
Aircraft used;
Location;
Air temperature;
Wind speed at arms length height - measured by anemometer;
General weather conditions, I.E. Cloudy, hazy sunshine, CAVOK, etc.;
Geomagnetic Field (Kp index);
Flight duration;
Max height;
Max distance from ground station;
No. of satellites acquired;
Down link quality;
Detected Wi-Fi sources;
Quality of landing;
Battery number;
Battery voltage at start;
Battery voltage at end;
Battery charge cycles;
Notes.
This is not exhaustive, but you get the idea.