A more thorough explanation:

Assistance of counsel means having a lawyer represent you, especially in a criminal case. This right is guaranteed by the Sixth Amendment of the United States Constitution, which says that in all criminal prosecutions, the accused shall have the right to have the assistance of counsel for their defense.

Effective assistance of counsel means having a lawyer who does their job well and represents you to the best of their ability. This includes advising you of your rights and performing all required tasks according to professional standards in criminal cases.

For example, if someone is accused of a crime and their lawyer fails to investigate important evidence or fails to call important witnesses, this could be considered ineffective assistance of counsel.

Ineffective assistance of counsel means having a lawyer who does not do their job well and deprives you of a fair trial. This could happen if the lawyer handles the case unreasonably, either by performing incompetently or by not devoting full effort to the defendant, especially because of a conflict of interest.

For example, if someone is accused of a crime and their lawyer has a conflict of interest, such as being related to the victim, and does not represent them properly, this could be considered ineffective assistance of counsel.

Courts generally consider several factors when determining whether a defendant received ineffective assistance of counsel, including whether the lawyer had previously handled criminal cases, whether strategic trial tactics were involved, whether the defendant was prejudiced as a result of the lawyer's alleged ineffectiveness, and whether the ineffectiveness was due to matters beyond the lawyer's control.