diff --git a/src/schema.gql b/src/schema.gql
index 454ff74..534b5a9 100644
--- a/src/schema.gql
+++ b/src/schema.gql
@@ -46,3 +46,18 @@ type Query {
   course(id: String!): Course
   teams: [Team!]
 }
+
+type Mutation {
+  createTeam(team: CreateTeamInput!): Team!
+  updateTeam(team: UpdateTeamInput!): Team!
+}
+
+input CreateTeamInput {
+  tgLink: String!
+  courseId: String!
+}
+
+input UpdateTeamInput {
+  id: String!
+  tgLink: String!
+}
diff --git a/src/teams/models/team.input-type.ts b/src/teams/models/team.input-type.ts
new file mode 100644
index 0000000..a403dc4
--- /dev/null
+++ b/src/teams/models/team.input-type.ts
@@ -0,0 +1,21 @@
+import { Field, InputType } from '@nestjs/graphql';
+
+import { ICreateTeam, IUpdateTeam } from './team.interface';
+
+@InputType()
+export class CreateTeamInput implements ICreateTeam {
+  @Field()
+  public tgLink: string;
+
+  @Field()
+  public courseId: string;
+}
+
+@InputType()
+export class UpdateTeamInput implements IUpdateTeam {
+  @Field()
+  public id: string;
+
+  @Field()
+  public tgLink: string;
+}
diff --git a/src/teams/models/team.interface.ts b/src/teams/models/team.interface.ts
index 18a153b..c68fb07 100644
--- a/src/teams/models/team.interface.ts
+++ b/src/teams/models/team.interface.ts
@@ -6,3 +6,7 @@ export interface ITeam {
   tgLink: string;
   memberIds: string[];
 }
+
+export type ICreateTeam = Pick<ITeam, 'courseId' | 'tgLink'>;
+
+export type IUpdateTeam = Pick<ITeam, 'id' | 'tgLink'>;
diff --git a/src/teams/resolvers/teams.resolver.ts b/src/teams/resolvers/teams.resolver.ts
index 944abeb..3c53017 100644
--- a/src/teams/resolvers/teams.resolver.ts
+++ b/src/teams/resolvers/teams.resolver.ts
@@ -3,8 +3,10 @@ import { CoursesService } from 'src/courses/services/courses.service';
 import { User } from 'src/users/models/user.object-type';
 import { UsersService } from 'src/users/services/users.service';
 
-import { Parent, Query, ResolveField, Resolver } from '@nestjs/graphql';
+import { Args, Mutation, Parent, Query, ResolveField, Resolver } from '@nestjs/graphql';
 
+import { CreateTeamInput, UpdateTeamInput } from '../models/team.input-type';
+import { ICreateTeam, IUpdateTeam } from '../models/team.interface';
 import { Team } from '../models/team.object-type';
 import { TeamsService } from '../services/teams.service';
 
@@ -34,4 +36,18 @@ export class TeamsResolver {
 
     return this.usersService.findByIds(memberIds);
   }
+
+  @Mutation(() => Team, { name: 'createTeam' })
+  public async createTeam(
+    @Args({ name: 'team', type: () => CreateTeamInput }) team: ICreateTeam,
+  ): Promise<Team> {
+    return this.teamsService.createTeam(team);
+  }
+
+  @Mutation(() => Team, { name: 'updateTeam' })
+  public async updateTeam(
+    @Args({ name: 'team', type: () => UpdateTeamInput }) team: IUpdateTeam,
+  ): Promise<Team> {
+    return this.teamsService.updateTeam(team);
+  }
 }
diff --git a/src/teams/services/teams.service.ts b/src/teams/services/teams.service.ts
index da1068e..d8fa53f 100644
--- a/src/teams/services/teams.service.ts
+++ b/src/teams/services/teams.service.ts
@@ -4,6 +4,8 @@ import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
 import { TeamEntity } from '../models/team.entity';
+import { ICreateTeam, IUpdateTeam } from '../models/team.interface';
+import { getNextTeamNumber } from '../utils/get-next-team-number.util';
 
 @Injectable()
 export class TeamsService {
@@ -19,6 +21,26 @@ export class TeamsService {
   }
 
   public findByIds(ids: string[]): Promise<TeamEntity[]> {
-    return this.teamsRepository.findByIds(ids, { loadRelationIds: true });
+    return this.teamsRepository.findByIds(ids, { loadRelationIds: true, order: { number: 'ASC' } });
+  }
+
+  public async createTeam(props: ICreateTeam): Promise<TeamEntity> {
+    const teams: TeamEntity[] = await this.teamsRepository.find({ courseId: props.courseId });
+    const nextNumber: number = getNextTeamNumber(teams);
+    const password: string = Math.random().toString(36).substr(2, 8);
+
+    const team: TeamEntity = this.teamsRepository.create({
+      ...props,
+      password,
+      number: nextNumber,
+    });
+
+    return this.teamsRepository.save(team);
+  }
+
+  public async updateTeam(props: IUpdateTeam): Promise<TeamEntity> {
+    await this.teamsRepository.update(props.id, { tgLink: props.tgLink });
+
+    return this.teamsRepository.findOne(props.id);
   }
 }
diff --git a/src/teams/utils/get-next-team-number.util.ts b/src/teams/utils/get-next-team-number.util.ts
new file mode 100644
index 0000000..80ba033
--- /dev/null
+++ b/src/teams/utils/get-next-team-number.util.ts
@@ -0,0 +1,24 @@
+import { ITeam } from '../models/team.interface';
+
+export const getNextTeamNumber: (arr: ITeam[]) => number = (arr: ITeam[]): number => {
+  let missedNumber: number;
+  let lastNumber: number;
+
+  const positiveNumbers: number[] = arr.map(item => item.number).sort();
+
+  if (!positiveNumbers.length) {
+    return 1;
+  }
+
+  positiveNumbers.some((element, index) => {
+    if (element !== index + 1) {
+      missedNumber = index + 1;
+    }
+
+    lastNumber = index + 1;
+
+    return missedNumber;
+  });
+
+  return missedNumber ?? lastNumber + 1;
+};