After learning type design and its principles for months I decided to start my first serious project. It is a Sans Serif family which I want to have a role of a Text Face. Currently I designed basic A to Z low and caps glyphs with period and comma for testing. I would appreciate all the mistakes and changes that could be made to make the typeface high quality. No kerning has been done yet. Sidebearings are set to 60 units for now "FontLab7".
A bad idea: thinking of sidebearings as something you establish later in the process, after the glyph design is mostly set.
What is your target size? At the small size of the paragraphs shown, all those intricate roundings are either pointless or even counterproductive (thickening the intersection of /t for example). And it's also too light for most applications at that size.
Try not to think of making each letter look great as you see it (big on your screen and isolated), but rather make them look great as they will be encountered (set in compositions at target reading size). This is a perspective that nearly every beginner has to be told, and it's even one I have to consciously remind myself about even after doing type design for some years.