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Hi i Feed back welcome

iam working as a angular developer (only javascript part ) so i decided to learn html,css,sass to increase my skill set. but iam not able to come up with class name my class names looks like variables.are my classnames are longer or can you suggest how can i decide class name atleast in this project?

2. i watched videos on bem method and sass but now iam not able to assign same class name for elments having similar style propertis because of i added nesting. so that element will get only style properties of the specified class if it has same nesting? eg? .cta__form .btn__submit

in this scenarios should i create a mixin for thes repeating styles or any other nice work arounds or should i avoid these extra nesting?