First, there is a meaning of "suggestion". The proposal to persuade peace also has this meaning. Please compare their similarities and differences in usage:

1) can take nouns as objects.

She suggested starting early. She suggested starting early.

We suggest visiting the museum the next day. We suggest visiting the museum tomorrow.

2) You can use gerund as the object.

I suggest putting off the sports meeting. I suggest that the sports meeting be postponed.

They suggested waiting until the right time. They advised (us) to wait until the right time.

3) All can be followed by an object clause. That clause is based on the verb should+, and should can be omitted.

She suggested that the class meeting should not be held on Saturday. She suggested that the class meeting should not be held on Saturday.

We suggested that he apologize to his teacher. We suggested that he apologize to the teacher.

4) advise can take infinitive compound object, and propose can take infinitive as object.

I advised him to give up this stupid idea. I advise him/her to give up this stupid idea. I advised him to give up that stupid idea.

We propose to start early. We propose to start early. We suggest starting early.

Second, it means "put forward", such as:

He proposed a different plan to his boss. He proposed a different plan to his boss.

Xiao Wang proposed a solution to the problem. Xiao Wang put forward a solution to this problem.

Third, it means "hint, show". Its theme is often things, not people.

1) is followed by a noun or gerund as the object.

Simple houses imply modern income. This humble house shows that the income is not high.

Her pale face indicates poor health. She looks pale and seems to be in poor health.

The idea of summer suggests swimming. When people think of summer, they think of swimming.

2) Followed by an object clause, which is a declarative mood. For example:

This decision indicates that he may take his family with him. This decision shows that he can bring his family.

The expression on his face showed that he was angry.

4. After the subject clause, it is suggested that ... and the noun suggestion, predicative clause and appositive clause indicating specific suggestions should be used with the verb prototype, and should can be omitted. For example:

It is suggested that we perform a program at the party.

His suggestion is to pay off the debt first. His suggestion is to pay off the debt first.

The doctors suggested that the new hospital should not be built on the mountain.