Glyph origins of '進'
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「進」 was originally constructed from semantic 「隹」 (picture of a bird) and semantic 「止」 (picture of a foot &gt; motion), indicating the flying motion of a bird, which infers the meaning forward, advance (birds cannot fly backwards). Later on, 「彳」 (left half of 「行」, picture of a road intersection &gt; roads, movement, path) was added to form the equivalent semantic component 「辵・⻍」 (walking, motion).
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Note, 「辵」 is the full form of 「⻍」. As stated earlier, 「辵」 is made up from a merger between 「彳」 and 「止」, shown again via 「過」 below.
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References:

何琳儀《戰國古文字典：戰國文字聲系》
小學堂
國學大師

郭沫若《甲骨文合集》
中國社會科學院考古研究所《殷周金文集成》