What's your question? Ask

These articles will help with growing broccoli, kale and cauliflower: https://www.gardeningknowhow.com/edible/vegetables/broccoli/how-to-grow-broccoli.htm, https://www.gardeningknowhow.com/edible/vegetables/kale/growing-kale.htm, https://www.gardeningknowhow.com/edible/vegetables/cauliflower/growing-cauliflower.htm

26 degrees C. may be a bit too warm for them. They form heads in cooler weather, and best in temps below 22 degrees C. You can help to encourage them to form heads by keeping the roots cooler. Since you are growing in containers, I have heard of people putting a few ice cubes on top of the soil during the day to help keep the roots cool and encourage head forming.

You may want to try blotting the cut end right after harvest and get them into the cold in your fridge as quickly as possible. Actually, to keep them crisp, you want to keep them as dry and as cool as you can quickly as possible.

It likely will not hurt the plant, but be aware that anytime you trim the leaves of a plant, you are exposing it to potential entry points for disease.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/broccoli/worms-in-broccoli-caterpillars-in-the-broccoli-head.htm

If you cannot eat it right away, you'll have to store it in the fridge or freeze it soon after harvesting from the garden. To store it, mist the heads, wrap loosely in damp paper towels and refrigerate. Make sure to use it within 2-3 days. Never store broccoli in a sealed plastic bag, as it requires adequate air circulation. To freeze broccoli, wash thoroughly and cut the florets and stalks into pieces. Steam or blanch these for about five minutes. Plunge into icewater, drain and place in sealed freezer bags or containers. Frozen broccoli can be store up to 12 months.