Hi, agree with teacher Michael, I would also add that the words depend on the context around them. I usually think about these words as follows. For the word advise, think of an advisor. So a firm, would go to an advisor to get some specific advice on something that they really plan to action. They don't want a suggestion or a recommendation, they want a plan or a path. For recommend, this is really softer advice. So something that is recommended to do, would really be just that, a recommendation from someone's point of view. For example, a board can recommend a course of action. For suggest, it's used for statements usually where there is more limited context (not a full description). For example, based on the information that you have provided to me, I suggest we proceed to do XYZ.

"advise" is a little stronger. You might "advise" when there could be bad consequences of doing something different to your advice. e.g. I advise you to do all of your homework. When you "recommend", you give your personal opinion on a preferred option. E.g. If you want to go to a good beach, I recommend that you go to Blackpool, which has lovely sand. "suggest" is similar to "recommend" and you can use "suggest" in the last example sentence. But "suggest" is also often used when planning things together e.g. I suggest that we speak to the client about this problem at our next meeting. Read the dictionary entries in Collins or another monolingual dictionary, read sample sentences, then write your own and ask someone to check them for you. Don't expect to master the differences between these words just from reading this post.