少安毋躁 is a short Chinese phrase that means keep calm, don't get excited, and don't be impatient or hot-tempered.

腳踏實地 is a four-character proverb that suggests that you should be practical, realistic, and grounded.

Some translate this as a suggestion to be down-to-earth.

The first character means “feet.”
The second means “step on” or “stand.”
The third means “solid,” “real,” or “true.”
The last character means “ground,” “earth,” or “terra.”

Literally, this means “[keep your] Feet Standing [on] Solid Ground.”

失意泰然 is a very old Japanese proverb that suggests “keeping calm and collected at times of disappointment,” or “maintaining a serene state of mind when faced with adversity.”

It's hard to relate individual character meanings to the overall meaning unless you also understand Japanese grammar. The word order is very different than English. That being said, here's the character meaning breakdown:
失 To miss, lose or fail.
意 Feelings, thoughts, meaning.
泰 Safe, peaceful.
然 Like that, in that way, however, although.

Using these definitions in English, we might say, “Although you may fail or lose, have a feeling of peace and calm.”

不怕慢就怕站 is a Chinese proverb that translates as: Don't worry about being slow; only worry about standing still.

Figuratively, this means: A slow progress holds some promise but to stand still promises failure.