Outdoor autos, zone 8, mixed strains, first time grower

First time trying to grow myself, and wanted to see if it can be done extremely casually. Not expecting much, just having fun and trying to learn. The experiment is trying to grow organic outdoors in zone 8b (Denmark). Whenever possible, I aim to mostly use stuff I already have/use each season for new plants and herbs inside/outside. No artificial lights, only organic nutes and tap water. I started germinating my first batch of mixed seeds mid April. I knew it would probably be too early, but I wanted to do 2 starting dates and learn from the early seeds to improve. Germinated and planted 11 seeds in a domed seedbox in the windowsill. Kept humidity 60-70%, while temperatures varied depending on sun exposure. PH should be ~6. In the windowsill they currently get ~8 hours of sun. They will get more when I am able to move them outside. I have fabric pots for the next round, but the first batch of seeds is just for learning. After 1 week (PICTURE 1) I planted 1 of each strain in degradable containers and put the containers in soil in pots. Left 1 of each seed in the seedbox removing the lid. After 3-4 days when the transplants acclimatized, I started taking them outside in the sun for 1-2 hours a day. Not sure if the sun was too strong or the weather too cold (around 15-17 Celsius in the shade), but they reacted very poorly and crumbled up, so I gave up on those. 2 weeks after germinating, I have now transplanted the rest from the seedbox to pots, buried most of the stem due to stretching and now keeping them in the windowsill