I finally get into darkroom and learn processes of making a contact sheets (and how it is useful, as I have no idea) and printing B&W negatives.
Setting the table, lens, enlarger ; check the light and the timer.
Adjust the focus eye-based and then using the macro viewer until seeing grain of paper.
1st test stripe : 2/2/4/8/16/32 (2/4/8/16/32/64)
2d test stripe : 16/2/2/2/2/2/2 (16/18/20/22/24/26/28)
The image is still flat = low contrast. Increase contrast grade +1.0 (above 2.5, below 3.5)
3rd test stripe : full stripe with ‘right settings’ (re-do as many times as needed to find the right ones)